Hi,
No there is none that I know of yet because it requires the content type to be multipart and I have not worked on the subject enough to give you a solution for it.
Either case this feature will be available in 0.9.2.0 which is probably coming in 1 month or 1 month and a half, 0.9.1.0 has switched to be Tweetinvi for Windows 8, Windows Phone 8 and Mono (Android and Linux).
If you are willing to implement this feature on your own, I think the best thing to do is have a look into the OAuthWebRequestGenerator.
Probably add :
The generation of the signature will probably need to be updated to not include the given parameters (https://dev.twitter.com/docs/uploading-media).
Obviously this no simple update but if you want to try it I can assist you on the road. Otherwise, I will do my best to quickly come up with a solution!
Linvi
No there is none that I know of yet because it requires the content type to be multipart and I have not worked on the subject enough to give you a solution for it.
Either case this feature will be available in 0.9.2.0 which is probably coming in 1 month or 1 month and a half, 0.9.1.0 has switched to be Tweetinvi for Windows 8, Windows Phone 8 and Mono (Android and Linux).
If you are willing to implement this feature on your own, I think the best thing to do is have a look into the OAuthWebRequestGenerator.
Probably add :
webRequest.ContentType = "multipart/form-data"; // line 244
Obviously this no simple update but if you want to try it I can assist you on the road. Otherwise, I will do my best to quickly come up with a solution!
Linvi