Hi @ACCDVermont,
Yes, the multiline apperance for image questions is supported in the web app. Which version was your survey originally published with? Out of curiosity, do you have version locking enabled, and if so, this may be the problem. The survey needs to be open in the latest version (at least 3.12 I think) for the multiline appearance on image questions to work in the web app.
Once version locking is off, or your survey shows as being publsihed in the latest version, you should see the image question with multiline appearance as follows in the web app. After adding the first image from the camera, I see a count and another prompt to add another image:
Note that using the method of camera or browse in the xlsform only applies to the field app, not the web app. If you want to attach images from file browser in the web app, you can use an file question type.
Regards,
Phil.