These are screen shots of the process I went through.
I have used a combination of the Google Drive app and the Chrome app, both of which are free.
Make sure that the photos you want to use are on the iPad.
I started by using the Google Drive app for the iPad.
Click on the + symbol on the top right and choose new folder. Then name your new folder.
Open your new folder from the drive list and click the + button again. This time choose to upload photos or videos.
It will ask to have access to your photos on your iPad.
Open the photo album choice and tick the photos you want to upload into the new folder.
Your nicely uploaded photo files will now be sitting nicely in their new folder.
Next, I used the Chrome app to work on my site.
Open the site page that you want to put the photo folder, and click on the pencil to edit the page.
On the insert menu, choose drive, then folder.
Tick the folder that you have just created and put pictures into.
Next, make sure you tick the option for the grid view. This way, you get a preview of your photos when the folder is embedded on the site page.
You embedded folder looks like a normal Google gadget when your page is in edit mode.
When you save your page, you can see the embedded folder with the photos that you uploaded. These photos are shown in thumbnail mode due to you ticking the grid choice.