It looks like if it doesn't complete the upload in a certain amount of time or passes, the file gets lost. This must be a housekeeping function on the satellite side. For example, today I get:
Open ABCD: Ready to upload file: N8URE18.jpg.out B: 715788744. U>> From:PFS3-12 to N8URE Ctrl: 63 Type: UA Res PF: 0 NR: 0 NS: 0 I>> SUCCESSFUL LOGIN to PFS3-12 by N8URE I>> UL ERROR 4: ER_NO_SUCH_FILE_NUMBER Bad File Number, will ask Pacsat for a new number on next attempt: /home/scalar/Falconsat_data/FalconSat-3/N8URE18.jpg.out Open ABCD: Ready to upload file: N8URE18.jpg.out B: 715788744.
It got to the "Ready to upload" point a number of times on the pass, but then wouldn't get past that stage. For example
Ready to upload file: N8URE18.jpg.out B: 715789771. PB: Empty..
and then it moves on to something else. There were a lot of stations on the pass, which I'm sure didn't help.
-Stephen N8URE