Hi , I'm Sergio, it's a pleasure to help you.
First, you should select the file.
Note: Only Office files can be edited within Teams.
Depending on the file type, you’ll see the some of the following buttons in the top right of the Teams screen.
• Editing: Here you can indicate whether you want to work with the file as an editor (the default) or reviewer, or simply view the file.
• Copy Link: To share the file with others, send them the copied link.
To change who can open the file and whether they can edit or download it, select People in your organization with the link can edit and make your choices.
• Catch up: Here you can view changes that others have made since you last viewed the file.
• Conversation: This will show you the chat or channel thread inside Teams that relates to the file.
• More options: Here you can choose to open the file in its web app or download it.
• Close: This will close the file and take you back to where you were in Teams when you first opened the file.
Source:
https://support.microsoft.com/en-us/office/edit...
If the problem still, then you should isolate the problem causes to solve it, please answer me:
- Are you using the last Teams update?
- Do you have pending Windows or Office updates to execute?
- Can you ensure that this file isn't a readonly file?
Greetings.