Upload DWG or DXF file in M-Files using C#

As far as M-Files is concerned the actual data type of the document should be largely irrelevant; M-Files simply deals with it as a set of binary data.  I haven't heard of others who have had similar issues.

Have you looked at the actual resulting HTTP requests using a HTTP debugging proxy to see what's being sent over the wire, and to see whether it's different between PDF and the ones that you are having an issue with?

As far as M-Files is concerned the actual data type of the document should be largely irrelevant; M-Files simply deals with it as a set of binary data.  I haven't heard of others who have had similar issues.

Have you looked at the actual resulting HTTP requests using a HTTP debugging proxy to see what's being sent over the wire, and to see whether it's different between PDF and the ones that you are having an issue with?

I don't use HTTP debugging yet.
Just check with POSTMAN, its working fine.
but in C# upload only PDF is correct other formats are corrupted.

If it works fine in Postman then there are no issues with the REST API, but there's obviously a difference in the resulting HTTP request in C# vs Postman.

A HTTP debugging proxy would be my next step.  If you have it working in Postman then it's a matter of playing spot-the-difference between the working request in Postman and the non-working request in C#.  Once you know that core issue you can look at what you might need to change in the C# application.