Adding images to announcements in OJS 3.3 - Tiny MCE

Description of issue or problem I’m having:

Can’t seem to add images to an announcement in OJS 3.3. The announcement WYSIWYG editor doesn’t have an option to add an image. Looking at the PKP School tutorial regarding announcements in OJS 3, it looks like there used to be an option to upload an image (Setting up a Journal in OJS 3: Module 8 Unit 6 - Announcements - YouTube), but I am not seeing it in 3.3. Was this option removed in the new version?

Steps I took leading up to the issue:

I tried dragging and dropping the image into the WYSIWYG editor, and that seemed to work while I was still in the editing interface, but, once I saved / published, the image simply didn’t appear on the public webpage, and, when I clicked to edit the announcement, the editor just showed a broken image link icon.

What I tried to resolve the issue:

Application Version - e.g., OJS 3.1.2:

Additional information, such as screenshots and error log messages if applicable: