If saw this warning in your site's status report:

Your server is capable of displaying file upload progress, but does not have the required libraries. It is recommended to install the PECL uploadprogress library.

… googled for a solution, and arrived here, then please read this core issue: #2718253: Uploadprogress PECL, documentation and recommendation on status report.

Flag Notify is a module that allows flexible email-based notification of comments, content and (optionally) groups using the popular Flag framework.

These pages describe the installation and usage of the module.
Click on the documentation specific for your version of the module:

• Why use Docker?

Locking

There are two different common locking problems you will likely encounter and it is very common to assume you have a single locking problem. Since these two locking problems are actually completely unrelated, it causes a lot of confusion as people look for the solution to “the locking problem” and get stuck on the wrong fix or a combination of the two.

Note: When I first wrote this you could test out the api on the api site but this is currently not possible as the forms have been removed. However Yotpo recommend using the Google Chrome Postman extension if you want to test the api.