Export settings, color profiles, and resizing to keep images sharp after upload.
What to do
Compare the source, export, composer preview and published image to locate the quality change. Avoid repeatedly recompressing an already compressed file, and keep essential text readable after processing.
Practical example
A designer replaces a screenshot with an original export and enlarges the date text before uploading.
Check your result
Inspect the final file at its intended size. Enlarging dimensions cannot recover detail absent from the source.