Hi - I appreciate the response from the private API email address. I'm adding a redundant copy of the request here for the record in case other folks want to chime in with their interest or disinterest in the feature.
It would be great if Tumblr's API supported the ability to upload an arbitrary media files (images, video, audio) for insertion inline in a non-media post.
For example, the web interface to Tumblr supports an "+ Add Image" link that lets users upload an image and insert it directly into a text post. This use case is not currently possible to simulate in a 3rd party client, because there is no suitable API call to "uploadImage" or equivalent.
This represents a major point of confusion for my customers who are used to writing text posts with embedded images.
Daniel