Cover errors are common and quick to fix. Here are the usual messages and the cure.
"Image is too small" / low resolution
Your cover is below the minimum (at least 1400px on the shortest side). Re-export at higher resolution — ideally 1600 x 2560 — and do not upscale a tiny image. See cover image requirements.
"Image is too large" (megapixels)
Some stores cap cover dimensions. If yours is enormous, scale it down to around 1600 x 2560 — that meets every store without tripping the maximum.
Wrong format
Use JPG or PNG. Convert other formats (TIFF, WEBP, PDF) before uploading.
"Embedded cover not found / not an image"
This is about the cover inside your EPUB, not your upload. Re-upload and let Chiify inject the cover during delivery; rebuilding from your DOCX also fixes it — see common EPUB errors.
If a cover still will not take after these steps, open a ticket with the file attached.
Still need help? Open a ticket from your dashboard or email [email protected] — a real person replies.