Resolved massive image import

Use the Joomla media/image manager to create a folder for these images - this route lets you add 10 at a time to a standard maximum of 10Mbytes total.

Then use PageBuilder to browse to this folder and select the images you need.

It can be done via SPPB media menager as well (read above).
It seems you do not understand what is in question here.

Use the Joomla media/image manager to create a folder for these images - this route lets you add 10 at a time to a standard maximum of 10Mbytes total.

Then use PageBuilder to browse to this folder and select the images you need.

It would be a good idea of update

Not good idea. It is not intended for a large number of images. Otherwise, you get a page that will be loaded for a long, long, long time. This is the same as to immerse in the trunk of a sedan concrete slabs. But for this there is a truck.
Сomponents should be used for large galleries. For example https://www.joomshaper.com/joomla-extensions/sp-easyimagegallery

hello, yes i know but i mean if i create a gallery with SP Pagebuilder, i'd like to import lot of pictures in one time.
It would be a good idea of update

Hello TOCHTERMANN,
Thank you for your question. Please go to Administrator -> Media and then upload multiple images. But at a time you can upload maximum 10MB.

- Best regards