Hi @Amit Patil
Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. According to your description, your question is not in our support scope.
Fortunately, I saw a post with the same appeal as yours, I hope this will be helpful to you.
How to upload/read/write document in teams Channel by using C#
Thank you for your understanding and support.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.