Hello goodday to you,
Problem is related to other posts of users such as:
https://www.8theme.com/topic/single-product-error-photo-tabs/
https://www.8theme.com/topic/no-product-image-on-single-product-page/
We tested by disabling 3rd party plugins and cleared cache. No result. Please find wp-admin access in private content area. Hope this access is enough. If you definitely need FTP access, we need your IP ti whitelist access.
Best regards,
G.