@Kavinga Ranaraja ,
Welcome to Q&A forum!
Per my research and test, you may need to remove all picture placeholders page by page.
- Please press
Ctrl + A
to select all shapes in your Visio file. - And go to Org Chart tab, select Show/Hide or Delete in the Picture group to hide or remove them.
To add customized headers to each page. I suggest you could refer to "Add a header video" to apply a custom header for each page.
Hope the information is helpful to you.
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