[Android] Auto delete backed up photos when n days old

[sirWest]

I like to use Resilio to have my phone photos automatically backed up. Since I'm managing/sorting them on my pc anyway then there is really no point in keeping them on my phone very long to waste space, even more with 4k videos. But whenever I delete any files from the DCIM folder that I have synced with it then Resilio marks them as deleted and this is an error for it's logic. It does keep syncing new ones but it's just seeing the situation as a problem and for it the solution would be to restore them from the backed up folder.

What I would like to see in the Sync app is some kind of one way backup-and-delete option, or just backing up would have an option to either delete the contents of the folder right away after backup or by some set age (delete everything older than n days). This way I could still pull the photos to view them if I want but they wouldn't all take space on my phone. Currently deleting them manually just causes headaches for Sync app and myself.