Topic on Extension talk:MsUpload/Flow

VisualEditor already has a simple way to upload files. There're no plans to make MsUpload work with the VisualEditor.

The wikieditor is not bad but I prefer using the VisualEditor. Is it possible to use this extension in conjunction with it?

Not really, and there're no plans for it, for now.

@SophivorusSeems it would be unnecessary as the functionality is in Visual Editor already according to this ticket: https://phabricator.wikimedia.org/T39932

Though in reality the functionality is not working as intended so I have filed a ticket here: https://phabricator.wikimedia.org/T208631

If you or any other devs on the MsUpload project would have some insight on fixing this issue that would be much appreciated I'm sure. Though I'm pretty clueless on this stuff so maybe it's not something people care about on the visual editor etc

Modifying MsUpload to work with the Visual Editor would require huge changes. It seems to me that the best way forward would be to fix the Visual Editor bug. The first ticket you linked had an amazingly positive response, so don't lose hope on the second one just yet!