
Hello Li. Unfortunately, once Microsoft Edge's PDF viewer crashes, especially with Adobe-powered editing tools, all unsaved annotations and text boxes are usually lost unless the file was saved before the crash occurred. Edge does not auto-save PDF edits in real time and the temporary edits are saved in temporary data area, which is volatile memory. Once the Edge process crashes or restarts the your temporary data has cleared. So, if you experience a crash, there is little chance to retrieve anything from the PDF viewer.
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