Is there an issue on your side connecting to Netflix? I'm trying to upload images via URL, and it takes ages. Oddly enough, the preview of the image appears almost immediately after pasting the URL, but after clicking Create, it takes forever to upload, and often returns error 504. Bulk uploading behaves funky. It also stalls forever, and then returns error 504. But apparently continues downloading in the background, because images randomly show up in some of the episodes (not all), a few minutes later. I found an old closed bug report stating that it is fixed, but obviously it is not, or not completely. Is that a known issue?
