I am sorry to hear you are experiencing issues due to a not supported functionality. As you already found out we have an item logged in our backlog to provide this functionality: PdfViewer: Support for Tab navigation between form fields. This item has a relatively high priority but I cannot engage with a specific date it will be implemented. I am afraid I cannot provide you with a workaround, so please, make sure you cast your vote for the implementation as well as subscribe to the task by clicking the Follow button so you can receive updates when its status changes.
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