Force a single folder sync

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**Is your feature request related to a problem? Please describe.**
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

**Describe the solution you'd like**
Sometimes a folder sync got stuck certainly with larger folders or folders with larger files when a mobile or WiFi net was too weak. A forced resync would help make sure everything is synced.

**Describe alternatives you've considered**
None available.

**Additional context**
A mobile app moves around and connectivity can vary wildly thwarting successful sync.