Additional settings-related features and issues within Microsoft Teams Free
Hello
I saw that AI gave you the clearing cache instruction. That does NOT delete your Teams chats or files, although some local preferences may be reset.
Microsoft Teams app itself doesn't store data.
Files shared in Teams chats are generally stored in your OneDrive, not in Teams itself. Go to your Onedrive and find this folder to clear them: Microsoft Teams Chat Files
Any files you actually "downloaded" from Teams are usually in your Windows' Downloads folder instead. You will want to delete from there.