@tagustin2020
Hi Teresa
Yes, the HTML text control will not show images like that.
You will have to do it blindly from the PowerApps side.
Since you are converting to PDF - this will be a Flow in PowerApps that you will use. In there, you should be able to get to the image properly.
If that is not successful, then you will need to get the image into an encoded base64 string and embed it.
There are some pretty good tutorials around on doing this, but if you have trouble finding a good one or run into issues...just post back.
EDIT: The video @VijayTailor references is a good one to demonstrate getting it into the base64 string to embed.