...late to the reply but in the hopes it saves anyone else with similar concerns:Polarr exports to the Camera Roll, as do Screenshots
The issue was that the filename seen by PhotoBackup is not that shown by various exif "Share Sheet" tools on the p…
It isn't necessary to add all the terrible old algorithms...PhotoBackup offers:diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
Picking the least worse option and adding this to my sshd config worked:KexAlgo…