You should really submit a support ticket…
This is the address:
You’ll need to choose episode form or episode portal form, choose episode portal form.
The address comes with emails from Episode, they should answer you soon after submitting the ticket.
You can also get to it from the setting in the app.
And one more question, did you try to upload covers for your story? It’s another kind of image you upload, I wanna see if you can’t upload anything at all, nut seriously, contact Episode.