Generate oauth_signature in upload api

[sapphire_nc]

Hello all,

I’m having difficulties while using twitter upload api (POST media/upload | Docs | Twitter Developer Platform)

This is the error i’m having
{“errors”:[{“code”:32,“message”:“Could not authenticate you.”}]}

Since the upload uses diferent method to generate oauth_signature (Media Best Practices | Docs | Twitter Developer Platform)

I think that this error that i’m having is related to the construction of oauth_signature, therefore i’m posting this thread to get some help from the experts

This is the code that i’m using, i think the error might come from line 81 but i don’t know what i’m doing wrong.

public void MssSignUploadRequest(string ssConsumerKey, string ssConsumerSecret, - Pastebin.com

Thank you all in advance.