Auto-upload to preserve the file timestamp.

### Is your feature request related to a problem? Please describe.
I setup the auto-upload for my new photos. I configure it to auto-upload when WiFi is available. That is, when the WiFi is available I might already have many new photos and the auto-upload will upload the new photos from the most recent photo to the most old photo of new photos. And then the file timestamps for the photos in the Nextcloud server would be incorrect. The list of the photos by the file timestamps will revert the order in each batch of the auto-upload.

### Describe the solution you'd like
The best solution is that the auto-uploaded photos have the same file timestamps as the origin.

### Describe alternatives you've considered
The alternative is keep the auto-uploaded photos file timestamps order the same as the origin. That is auto-upload from the most old photo to most recent photo of the new photos.

### Additional context
Optional to provide an option about keep the file timestamps (modify time) when setup auto-upload.

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