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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
We treat missing msg bugs in Element as a top priority red alert for obvious reasons. I’m only aware of one recently, which was iOS specific and matches your symptoms - but very rare indeed. It got fixed in https://github.com/matrix-org/matrix-ios-sdk/pull/1359 and was a leftover from the nightmare of iOS changing how push worked. Sorry that you got bitten by it. The fix is released in Elemebt iOS 1.8.0.
Actually I just thought of the single problem that I have with it - it doesn't support multiple identies.
https://github.com/vector-im/element-web/issues/2320