Hi Mamoon, thanks for your response. I have been using REST API, but also tried the SOAP API. I would like to try a workaround so I don't need to rebuild this when the SOAP API is retired.
I created a custom field on my Activity table called "InputAudioFile" which is a fileType field and I added this to my Classic Custom Activity Screen where I can add a file manually.
All I need is some way to add a file through an API so I can access it from a Classic screen.
Is there no way to update a fileType field through the REST API?
What would you suggest to accomplish what I'm trying to do.