Hi,

Is your feature request related to a problem? Please describe.

Latest version of Files.Upload takes a filepath(string) for the file to upload, which makes it difficult to upload files that do not exist on file systems. (eg. image bytes that were generated with other tools)

Describe the solution you'd like
It would be great to have it take io.Reader, or add an additional function to do so.

The older SDK has two versions of Upload function:

• which takes io.Reader
• and which takes filepath