I've made the whole site SSL-enabled, but only the gallery page using FooGallery was in unprotected communication... I've solved it, so I'll make a note of it so I don't forget!

Only the FooGallery page is not secure.

Only the gallery pages using FooGallery were not protected, and I was unable to add a lock mark.

If you look at the source code, you will see that the image path starts with http.

First thing I tried! Reload the image

The most common pattern is for the image path to start with http and not have a lock symbol.
So I reloaded the images in FooGallery as well.

Simply select the image again. The result will be the same.

What I tried next! Create a new gallery

Maybe it was cached, but when I looked at the media in WordPress, the image path started with https, but when I created a new gallery in FooHGallery and looked at the source code of the published page, it was http...

I was struggling because I couldn't find any solutions to similar cases even after searching the internet.

[Solved] Check the settings of FooGallery

I had no choice but to solve the problem myself, so I reviewed the settings. They were all in English. I looked for something like that.

FooGallery > Settint > Advanced

It was inside!

The part that says "Force HTTPS." Do you want to force it to https?
Checked!

Just by doing that, all image paths changed to https and a lock symbol appeared in an instant!

I hope this helps anyone with a similar problem!

At hanami-web, we solve a variety of problems related to WordPress!