Setting to sync photo from a specific point of time.

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Feature request

Is your feature request related to a problem? Please describe.
When the Nextcloud iOS app is reinstalled or set up on a new device, the photo auto-upload settings are reset. Currently, the app only offers two syncing options: sync all photos in the camera roll, or sync new photos from this moment onward.

If I previously synced my gallery up until a month ago and then reinstall the app today, I am stuck between two bad options. Choosing "sync all" will attempt to re-upload my entire gallery (wasting battery, bandwidth, and time). Choosing "sync only from now on" will skip all the photos taken over the last month, leaving a gap in my backup.

Describe the solution you'd like
Please add a feature to set a custom "Start Date" when enabling auto-upload. This would allow users to select a specific date from a calendar picker, instructing the app to only sync photos and videos taken on or after that chosen date.

Describe alternatives you've considered

• Manual Upload: Manually tracking down, selecting, and uploading the photos taken during the gap period, and then setting auto-upload to "new photos only." This is tedious, time-consuming, and prone to user error.
• Relying on Server Deduplication: Selecting "sync all" and letting the Nextcloud server skip existing files. However, this still forces the iOS app to index and process thousands of old photos locally, which severely drains the iPhone battery and takes a massive amount of time to complete.

Additional context
This feature would be incredibly helpful for users migrating to a new iPhone, recovering from an app reinstall, or managing self-hosted instances with strict storage limits, as it allows them to seamlessly resume their sync history without redundantly processing their entire lifetime camera roll.

Start by tracing the iOS app's photo auto-upload settings and the existing choices for syncing all photos or only new photos. Determine where a custom start date and calendar selection would feed into photo and video discovery, then verify that uploads include items on or after the selected date without reprocessing the entire camera roll.