Storing documents locally or in cloud services from within Teams
Hello Murtaza, My name is Indhurani, I’ll be happy to help you today.
To meet your requirement, since these files are stored on the same name SharePoint site, you need to contact the site owner/admin, and let them set the option“Require documents to be checked out before they can be edited“to Yes via Library Settings> Versioning settings. After that, when users open files that are stored in the library, the file is opened in View/read-only mode.
>>Also, you can try the below trick and check if it is working
Open the file in the Word app and then select "Edit" from the File menu. This will allow you to edit the document and save your changes back to Teams.
Please refer to the link below to the thread where similar issues were talked about:
https://answers.microsoft.com/en-us/msteams/for...
Hope it will be fixed. Please let me know if you still need further assistance.
Regards,
Indhurani