Don't auto upload - just move (if move to app folder is selected)

### Is your feature request related to a problem? Please describe.
I have my photos and videos on autoupload and activated the option to move the file to app folder. I have been using the Next/OwnCloud tools since 2013 and since then the auto upload of pictures has been a geht/geht-nicht (works/works-not) feature. And when the updload is missed, it could happen to a bunch of files and they all stay in the camera folder until moved manually.

I would like to have no files at all in my camera folder and all of them in a filder that is cloud synched. But I think this can be fixed :))

### Describe the solution you'd like
Add two options to the auto upload item setup dialog:
- If move to app folder is set, add option to "always move"
- If move to app folder and always move are set, add option to state "also move existing files"

In the case of the "always move" option don't even try to upload the file, just move it to the app folder and let NextCloud handle the upload/sync later. You can do this immediately.

"Also move existing files" - or "Keep folder clean" - means to move any file that could be found in the source folder at any time to the app folder location defined by the "Use subfolders" setting.

The only thing that is needed would be some kind of a trigger to sync files when certain criterias are met - like instantly, or only when connected to wifi or charging.

### Describe alternatives you've considered
I was looking for an app that would do what NextCloud does after uploading the file - move it to an appfolder with options how to place it - and then let NextCloud handling the sync. Nothing found yet.