Large compressed uploads fail most often because the archive is bigger than the plan storage allowance, the connection drops, or the ZIP contains unnecessary files. Start by checking the archive size and the storage shown in your dashboard.
Make the archive smaller before upload
Upload only production files. Do not include source maps, local backups, dependency folders such as node_modules, raw camera originals, or previous ZIP files. Build the site, then compress only the output directory.
Protect the transfer
Use a stable connection and keep the upload tab open until processing has completed. If a large archive fails, do not repeatedly submit the same file without checking the error message. First remove unused files, verify available storage, and create one clean ZIP again.
After the upload succeeds, test the extracted website rather than assuming a successful transfer means every path is right. A large file can publish cleanly while an incorrectly nested index.html still causes a 404.