This is covered in the “Limitations” section of the Large Media documentation here:
Quoting:
- Files tracked with Large Media are uploaded directly to the Netlify Large Media storage service on push, completely bypassing the site build. This saves build time, but also means that the files are not available to tools that process asset files during the build, such as Hugo’s image processing or the
gatsby-imageplugin. Depending on your needs, you may be able to replace this functionality with Netlify’s image transformation service.
Is not possible to do build time transforms with Large Media.
If you want to uninstall Large Media for this reason, would you please confirm you have read the following Support Guide?
If you have read that, please confirm you have backups of all files and let us know which site to remove Large Media from. To identify the site, you can send us the site subdomain, API ID (the id not the key), or a link to the site (whichever you prefer).
Once we know which site, we’ll reply soon to confirm the add-on has been uninstalled.
Please let us know if there are any questions and, if not, please tell us the site to do this for. If you want to leave Large Media active for this site, we’ll take no action unless you tell us to do so.