How to scan photo albums?

Question

In contact with

there is a group that sells products
and products are placed in the galleries

for each product the main photo in the gallery and a description for it
and in the comments to the photo additional photos and texts

example: https://vk.com/photo-119916632_457277056

how to bypass all the galleries and all the photos in all comments download to your server and all the texts?
is it possible to do all this using vk api?

all this is necessary in order to transfer all the data (pictures and texts) to your site

and is it possible to use VK pictures on your site,
that is, use VK as image hosting