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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 17.0.6
Operating system and version (eg, Ubuntu 20.04):Debian 6.3.0-18+deb9u1
Apache or nginx version (eg, Apache 2.4.25): nginx 1.6.2-5+deb8u4
PHP version (eg, 7.1): 7.1.33
The issue you are facing: We are not able to select any of tagged file
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- In left menu choose “Tags” and list files based on some TAG
- Try to select some of files to make an action (e.g. Delete them) as it is possible in “All files” menu
- There is no choice to select tagged files (despite there is “Select” option in right click menu of a file)
but to be honest I think it’s intentionally, not sure tho.