↔️ 2 way sync for internal folder

[tobiasKaminsky]

First step for #19

• in folder detail -> "keep up to date" (or other name)
• in settings
  • new section "sync"
  • move auto upload to new section
  • add "internal sync" to new section
    • show all synced folders
    • with last run, sync result

[szaimen]

🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉

[miltuss]

It doesn't work, clicking on the internal 2-way-sync nextcloud parameter sends me to a blank page. And I'm not the only one in this situation!

How to solve this problem?

[joshtrichards]

@racchio @marcel2789 @ZoraItIs Please see #13738 where that matter is covered.