You have implemented this feature 5 years ago https://acrobat.uservoice.com/forums/590923-acrobat-for-windows-and-mac/suggestions/19741672-add-an-addional-field-type-picture-field-in-the

It seems like the feature is thus far undocumented: https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf

Would it be possible that you could document it in your next iteration of the pdf specs so that we can have a chance of it working in other software as well?

I have tested and the feature works in both acrobat and foxit, but when I load the document in any browser, the picture insertion field does not work...

I can't believe it if I am the only one facing this brick wall...

We are an NGO with the purpose of creating infrastructure for artists, and we need this feature so we can make forms for them to claim stuff they are entitled too.. Telling them to install additional software (like acrobat) to be able to use it will be a non starter for some..