Even if you are using Azure blob storage, you will upload your data trough the Mendix runtime. If forwards the data. Which might be limited in capacity or bandwidth.
Azure has a Delegated access
What kind of content do you store? Large files for distribution in the Mendix platform is not ideal. For example video should be handled with a video services for best user experience.
Thanks for your idea. We are uploading revit files, so not something to display in the Mendix platform, but later on used in another application. So your workaround should work for us as well. Maybe that will improve upload speed from China as well, because currently they only reach 0.73 Mbps!
However, it would be great if Mendix would be clear about the values that we could expect.