When uploading am image onto a text note, exiting the note and going back in, the image is gone and shows an error icon in its place, and also won't display directly on other devices, including on the desktop version. Uploading the same image on the same note through the desktop client doesn't seem to have this issue, and will load and render correctly on other devices. I think the mobile app isn't uploading the image data correctly, if at all. Uploading the same image onto a dedicated image card on mobile also appears to work correctly.