It is recommended to format USB flash drives in NTFS

If the flash drive is 16 GB or larger, it will be displayed as an archive disk in the settings of the "Archive" section and TRASSIR will offer to format it.

Do not click format! Otherwise, TRASSIR will format the flash drive as an archive partition and will start recording the video archive on it.

In File manager of Trassir GUI, find the root directory ( "/" ):
 

Then, find media

Then you will see you flash drive, which has mouned with some number, for example:

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