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Sorry to hear you’re facing problems 
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Nextcloud version :15.0.2
PHP version (eg, 7.1): 7.1.25
The issue you are facing: Can’t share files, the section where I should be able to see with whom the file is shared is blank.
Steps to replicate it:
- Install and activate all the “social sharing” apps (Dispora, Facebook, Google+, …)
- Go to files
- Select a file and click onto “share”
This is what it should look like:
This is what it actually looks like:
