The H5P file_storage class has a function called getUpgradeScript, which fetches the upgrades.js file of a H5P library. The script looks for a file called "upgrade.js", however the file is called "upgrades.js" (see https://h5p.org/documentation/developers/content-upgrade). This results in the upgradeScript property always being null in the ajax.php call (action=libraries).

Reproduction

1. go to the content bank
2. create a new H5P instance, for example "Fill in the Blanks"
3. open network tab in developer tools
4. click the second ajax.php call (it looks a little like this: ajax.php?action=libraries&machineName=H5P.Blanks&majorVersion=1&minorVersion=14&language=en)
5. inspect the response and the upgradeScript property

What I expected

The response to contain the upgradedScript property with a link the a JS file called upgrades.js.

What actually happened

The upgradedScript property is null