Add multiple images
Not sure what the div tags in your post are for… just type in normal text, then click the upload button on the toolbar to upload images.
Firstly, please make sure you have the latest version of the application installed. You cam do that direct In Hololens2 by visiting Microsoft Store and searching for SketchUp Viewer.
Then, with a working internet connection, launch the application, click Sign In… and wait. It takes several seconds but eventually an Edge browser window will pop up prompting you to sign in. I recommend you ask Edge to save your user name and password for faster access in the future.
Let me know if that works.