Hi there Javid B,
Welcome to Microsoft Community
I'm Bobadoye and I'd be happy to help you out with your question.
Apologies for the inconvenience, if you are experiencing this issue on your Teams application you can try Teams web (https://teams.microsoft.com) and see if you can send picture successfully.
- Check for update and update your Teams application
- Clear Teams cache
- Uninstall Teams, restart your device re-install Teams
- If you are experiencing the same issue on Teams web, clear your browser cache and cookies, use incognito/private browser or you consider using a different browser
I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further.
Best Regards,
Bobadoye