Go to the files tab
in any teams group
Click on the 3 dots
next to a document and click delete
If you can't delete
the file you may need to be an admin in that group please contact IT support
for further advise
Support :
Corporate Travel Management (freshservice.com)
To delete the files
in a teams chat go to files on the left hand side of your screen- click on the
onedrive logo then microsoft teams chat files folder-
You can delete the
files from here