After every Auto Move run, APPtoSD PRO lists the files it skipped together with the reason. These are the most common reasons and what to do.

File is larger than 4 GB (FAT32 card)

SD cards formatted as FAT32 cannot store a single file larger than 4 GB, which is common for long 4K videos. Either keep these videos on the phone, or back up the card and format it as exFAT on a computer (most cards of 64 GB and more already use exFAT).

The SD card is full

Free space on the card, or change the rule to move only files older than a number of days so less is moved at once.

The card is read-only, missing or ejected

Check that the card is inserted and mounted in Settings → Storage. If Android reports the card as read-only or damaged, use the SD card test in APPtoSD PRO before moving more files to it.

Permission was removed

Android may remove the file access permission after an update or a reset. Open APPtoSD PRO; it shows which permission is missing and opens the right settings page.

The file was in use

A file that is being written (for example a video that is still recording or downloading) is skipped and moved on the next run.

Tip: Tap Retry on the result page after fixing the cause – only the skipped files are tried again.