Modern smartphones have turned into powerful pocket computers capable of solving many tasks that previously required a laptop or desktop PC. Transferring photos, videos, documents and installation files between devices often becomes a routine necessity. Fortunately, the ecosystem Android provides flexible tools for working with external media, allowing you to directly connect USB flash drives without the use of wires and intermediate links.
However, the process is not always automatic and intuitive for every user. Differences in firmware from Samsung, Xiaomi, Realme and other manufacturers may hide the necessary switches in different corners of the menu. In this article, we will look in detail at how to view files on a flash drive on Android, what technologies underlie this interaction, and how to avoid common errors when transferring data.
The main condition for a successful connection is the smartphone's support for technology USB OTG (On-The-Go). This feature allows the mobile device to act as a host, supplying power to peripheral gadgets. Without hardware and software support for this option, the phone simply will not be able to recognize the inserted drive, regardless of the quality of the flash drive itself.
Checking compatibility and preparing equipment
Before you try to open the contents of an external drive, you need to make sure that your device is physically capable of interacting with it. Not all budget models from previous years support host mode, although in 2026-2026 this feature became standard even for the entry-level segment. The easiest way to check is to search for information about your model in the specifications on the manufacturer's official website or use specialized utilities from the store Google Play.
The second critical element is the correct adapter. A standard flash drive connector (Type-A) does not physically fit into the charging port of a smartphone (most often USB Type-C or outdated Micro-USB). You will need a quality OTG adapter. Cheap Chinese copies often have poor soldering, which leads to an unstable connection, overheating of the port, or a complete lack of system response to the connection.
It is also worth considering the file system in which your drive is formatted. By default, Android perfectly reads FAT32 and exFATformats. If your flash drive is formatted in NTFS (standard for Windows), the phone may offer to format it, which will lead to the deletion of all data, or will not see it at all without installing third-party drivers.
⚠️ Attention: If, after connecting the flash drive, the smartphone begins to quickly discharge or heat up in the port area, immediately disconnect the device. This may indicate a short circuit inside the adapter or incompatibility of volt-ampere characteristics.
Use adapters with a metal case and a shielded cable - they better dissipate heat and protect against interference when transferring large amounts of data.
Activating the USB OTG mode in the settings
In some shells, such as ColorOS from OPPO or Realme UI, the function of connecting external drives is disabled by default to save battery power. The user must manually activate this mode before each use or set it to work continuously. Ignoring this step is the most common reason why the phone “does not see” a working flash drive.
To enable it, go to the main settings of your smartphone. The path may differ depending on the Android version and skin manufacturer. Usually the required item is located in the Additional settings or Connectionssection. Find the switch with the name OTG connection and move it to the active position. In interfaces OneUI from Samsung, this option is often enabled automatically and does not require user intervention.
After activation, a drive icon should appear in the notification panel. If this does not happen, try reconnecting the cable. Some phones require the screen to be unlocked at the time of connection to initialize the drivers. Also make sure that the flash drive does not have a mechanical write-protect switch, although on mobile devices this affects the ability to copy files rather than display them.
Selecting a file manager to view
When the physical connection is established, the next step is to navigate through the file system. Standard Android tools can be limited in functionality, especially when it comes to specific formats or hidden folders. Choosing the right file management tool is the key to convenient work with data on external media.
Most manufacturers pre-install their own applications. For example, on devices Xiaomi it is “Explorer”, on Samsung it is “My Files”. These apps usually have a nice interface and basic copy and move functionality. However, for advanced users who need access to system folders or work with archives, third-party solutions are better suited.
The leaders among third-party applications Total Commander, Solid Explorer and FX File Explorer. They provide a two-panel mode, which is extremely convenient when transferring data: the internal memory is displayed on the left, and the flash drive on the right. You simply drag and drop files from one window to another. Such managers also know how to work with network storage and cloud services, expanding the capabilities of the device.
| Application name | Key feature | Plug-in support | Price |
|---|---|---|---|
| Files by Google | Garbage cleaning and fast search | No | Free |
| Solid Explorer | Two-panel mode and encryption | Yes (clouds, FTP) | Paid (trial) |
| Total Commander | Minimalism and powerful plugins | Huge quantity | Free |
| CX File Explorer | Storage analysis and network access | Partly | Free |
When you launch any manager for the first time, make sure that you have given it the necessary permissions. In modern versions of Android (starting from 11 and higher), access to files on external media is regulated by strict security policies. The application may request permission to access all media files or require confirmation of the selection of a specific folder through the system window.
Step-by-step guide for viewing files
Now let's move on to the actual process of opening data. The algorithm of actions is quite simple, but requires care at each stage so as not to damage the information. Follow this sequence for a guaranteed result.
First, connect the flash drive to your smartphone via an OTG adapter. Wait for a beep or vibration to confirm the device is connected. Swipe down from the top edge of the screen to open the notification shade. There you should see a message “USB storage connected” or similar.
Click on this notification - the system will automatically offer to open the file manager. If the automatic transition does not occur, open the Explorer application manually. A new entry will appear in the side menu or on the main screen in the “Storage” section with the name of your flash drive (often displayed as USB storage or drive brand).
☑️ Connection algorithm
Click on the drive icon. The root directory of the flash drive will open in front of you. Here you can sort files by type, date modified, or size. To view photos, use the built-in gallery by simply clicking on the image. Video files may require a third-party player, such as VLC or MX Playerif the built-in one does not support the codec.
⚠️ Attention: Never remove the flash drive while recording or copying files. This is guaranteed to lead to file table corruption and data loss. Always use the “Safely Remove” function.
Solving problems with formats and reading
Sometimes it happens that the phone detects the presence of a device, but writes that it is damaged or requires formatting. Most often this is due to file system incompatibility. As mentioned earlier, native support NTFS on Android is limited. If you work with large files (more than 4 GB), the FAT32 format will not work and exFAT is required.
If your flash drive is formatted in NTFS and contains important data, do not agree to formatting by the system. Instead, install a driver application, for example Microsoft exFAT/NTFS for USB by Paragon Software. It mounts partitions in read-write mode, allowing you to work with “non-native” formats without losing information.
Another problem is nutrition. Large flash drives or external hard drives (HDD) may consume more current than the smartphone port can supply. In such cases, the phone may cyclically connect and disconnect the drive. The solution is to use an OTG hub with additional external power, which will allow you to supply the required voltage to the disk from an outlet.
Why are files copied slowly?
The transfer speed depends on the USB standard (2.0 or 3.0) both on the phone and on the flash drive, as well as on the quality of the adapter. Cheap cables often operate only in USB 2.0 mode, limiting speeds to 10-15 MB/s, even if devices support higher speeds.
Safely removing and servicing the drive
Finishing work with external media is no less important than connecting it. The Android operating system uses write caching to speed things up. This means that when you see the “Copy Complete” message, the data may still be in RAM and not physically written to the sectors of the flash drive.
To properly turn off the device, lower the notification shade again. Find the USB drive icon and click the Eject or Dismount button. Only after a message appears indicating that the drive is safely disconnected can you physically pull out the cable. Ignoring this rule is the main reason for the appearance of bad sectors and read errors in the future.
Check the condition of the flash drive regularly. Flash-based file systems have limited write cycle life. If you notice that the writing speed has dropped or files are starting to disappear, the drive's resource may be exhausted. In this case, it is recommended to replace it with a new one so as not to lose critical data.
To extend the life of the drive, try not to fill it to capacity. Leave 10-15% free space. This is necessary for the memory controller to effectively distribute the load (wear leveling) and maintain high write speeds when updating existing files.
Safe ejection via the notification menu is mandatory to maintain data integrity, even if it seems that all processes have already completed.
Can a flash drive be used as permanent memory for installing applications?
Starting with Android 6.0, there was an Adoptable Storage function that allows you to format a flash drive as internal memory. However, most manufacturers (Samsung, Xiaomi, Huawei) have disabled this option in their firmware due to the low speed of external drives compared to the built-in UFS memory. Forced activation is possible through ADB commands, but this is unstable and can lead to data loss when the flash drive is disconnected.
Why does the phone not see the flash drive, although it is working?
There may be several reasons: the OTG function is disabled in the settings, the adapter is faulty, the flash drive is formatted in an incompatible file system (for example, APFS or ext4) or the smartphone port is dirty. It is also possible that the flash drive uses an MBR partition scheme, and the phone requires GPT, although this is rare for conventional drives.
How to transfer photos from a flash drive to the cloud directly?
This is possible through file managers with support for cloud services, such as Solid Explorer or CX File Explorer. Connect the flash drive, open the manager, select files on the USB drive and use the “Send” function or the built-in plugin to upload to Google Drive, Yandex.Disk or Dropbox without intermediate copying to the phone’s internal memory.
Does using OTG affect battery life?
Yes, working in host mode requires additional energy to power the connected device. Active reading or writing of large files can increase battery consumption by 10-15% per hour. It is recommended to monitor the charge level during long-term data transfer operations so that the phone does not turn off at a critical moment.