Why can’t I enable the “Publicly accessible” sharing option for my asset?

Assets exceeding a certain size will not support the "Publicly accessible" sharing option. Consequently, the only sharing method available for such assets is private sharing by user email login. Private sharing is available on every plan except Individual and legacy Core, so an asset over the limit currently cannot be shared at all on those two plans. To keep the "Publicly accessible" option available, keep your assets below 600 million triangles. For even swifter loading times, consider keeping assets below 100 million triangles.

There are no restrictions on the number of textures or photos you can upload; you are free to upload as many as you desire.