When assets (covers, content files such as ePub and PDF files, or manifests) are added to the NetGalley using the Deliver Files page and successfully imported into your NetGalley publisher account, you will receive a NetGalley Import Report email.
The email is sent to the email address specified in the File Import Notices field in your account. (How do I change that?)
If you have added an asset and it is not included in the email report and is not available in your NetGalley account, double check that your files are named correctly and uploaded, using these exact instructions. Re-upload the file if it was misnamed the first time.