Hello
so, i m reinstalling windows on a friends PC, we use Nextcloud both on Drive D with same Foldername and so on. So i accidently delete the patition (i wanted to resize ist) while a certain folder was already synchronised. Ops (i’m sleepy).
Well i redid the patition and restarted Nextcloud but my friend does not have that folder anymore… i went to nextcloud activities via Browser and it says: “Friend removed themselves from said folder”
Is htere a way to undo this? (other than soecificall sharing the folder with that friend) .
we usually share certain folder via groups and i dont wanna mess that up by “handsharing” single folders…
how ever this is not the first time something like this happen and i could have sworn that there was an option to undo that but i neither find the thread here nor that option anymore! 
Nextcloud version: [Nextcloud] 19.0.4
Operating system and version: Ubuntu 18.04
Apache or nginx version: Apache 2.4.29
PHP version : PHP 7.2.24
The issue you are facing:
Is this the first time you’ve seen this error? This way, by deleting the patition (who does that anyway) yes
Steps to replicate it:
- have Nextcloud shared folder of other patition
- delete said patition (argh i really need sleep!)
- set up patition and Nextcloud folder again (everything seemed ok)
- restart nextcloud - ops folder is gone from this account