Comment 3 for bug 1848100

Retested - failed

- Browsers tested: Edge, Chrome and Firefox
- Themes: Primary school(Person Bob) and Raw (Person admin)

Steps
Preconditions:

1. A logged in person has at least one image in their home files folder and at least one sub-folder named 'images' with several image files in it.

Test steps: (repeat these for each browser/theme)

1. Person selects to create a new skin (Main menu|Create|Skins--> Create skin - or edit an existing one )
2. Select the 'Page' tab
3. Select the Page background image's 'Add a file' button and select the 'image' sub-folder
4. Select a filename to preview a file's content
5. Close the Download/preview modal
5. Select the tick to select a file ✘
6. Save the page
Actual result: (see Edge attachment) when the user selects to close the download/preview window, the 'Add a file' modal also closes.
Work around: the user can reload the 'Add a file' modal and select an image (WITHOUT previewing it!) by selecting the file's tick then Save it.