The Images tab within the Storage section in your account is where you can manage all of the images stored on your website.
From here, you can upload new images (by clicking Upload Images), delete images (by selecting the images you want to delete and then clicking Delete Image), and view image details (by clicking the image and viewing the information to the right hand side of the page). You'll notice that in the photo 'details' to the right of the page that there is a custom URL displayed for each image. If you need to link to a particular image from elsewhere on your site, you can do so by linking to that URL.
You can also create Collections of images (essentially separate photo albums) by clicking 'New' under 'Collections'. From there, you'll be taken to a screen asking you to name the collection, as well as add the images you want displayed in the collection.
The cool thing about collections is that you can access them while adding photo galleries in the Page editor (Pages section of your account). To explain how this works, I'll walk through the steps of setting up a photo gallery on a sample website using a collection I made in the 'Images' area of the 'Storage' section in my account. First, you'll need to select the page you want to add the photo gallery to while in the Pages section of your account, and then click 'Edit'. From there, click the 'Add a block' button to bring up all of the content blocks, and then drag the 'Gallery' block onto the page.
Then, choose the 'Select Existing' to choose one of the collections you've already created, and then select the collection of images you want displayed in the photo gallery. Once you've done this, you'll be shown some additional options for the gallery, allowing you to further customize it. When you're done, click 'Publish' to save and apply the changes to the live version of your site. When you're done, the gallery will look something like this (depending on the gallery's settings you chose):
If you need to add or remove images for the gallery at a later date, just select it in the page editor and click 'edit'.
If you have any additional questions about how to manage the images on your website, please let us know. We're happy to help!