Faster and easier way to add multiple photos to a photo gallery

Is there a faster and easier way to add multiple photos to a photo gallery? In the shown example, I have to upload one photo twice.

First time: Image > Replace Image > select photo from directory
Second time: Gallery Box > Options > Replace file > save

If the gallery has 100 photos, for instance, the whole process takes too long.

Is there a faster way to create a photo gallery with a large number of photos?

Can you use CMS to create a photo gallery for, let’s say, 100 photos and then connect it to the Gallery Box to display the photos when clicked?