A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Hi Nice&busy,
Thanks for using Microsoft products and posting in the community, I'm glad to offer help.
According to your description, to highlight text in a picture in PowerPoint, we can use the Highlight Pen under Draw tab, shown as below:
Please note that the ink won't move when you move the picture, it will stick to a fixed position on the screen, to make it stick to the picture, please press CTRL and left-click to select the ink and picture, and then group them.
And if you can't see "Draw" tab, please go to File > Options > Customize Ribbon to enable it.
If you are using PowerPoint for Mac, please refer to Customize the ribbon in Office to enable "Draw" tab and do the same steps as above.
I hope the above method can be helpful, if I have any misunderstanding of your situation or you have any concerns, please feel free to let me know, I'll continue to help you.
Best Regards,
Arck