Website Gallery

Hello, I have been using Adobe Muse and have now transferred to Pinegrow. I need to know if there is any way of implementing a gallery in my website without having to add each picture to the code. I am using a bootstrap template.
The charity would like to add several large themed galleries to their website but it looks like a lot of work! Any ideas would be appreciated.

I’m pretty sure there’s no drag & drop solution to this in Bootstrap. But it’s pretty easy to add a third-party or open-source gallery.