Product: PDFTron.iOS and PDFTron.iOS.Tools
Product Version: 11.3.0
Please give a brief summary of your issue:
We are facing a consistent issue in PDFTron iOS where annotation deletions are not persisted when all annotations are removed from a document.
Please describe your issue and provide steps to reproduce it:
Observed behavior:
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If a PDF contains N annotations:
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Deleting N-1 annotations works correctly
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The remaining annotations are saved properly via XFDF
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However:
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The last remaining annotation cannot be deleted
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If all annotations are erased at once, none of the deletions are persisted
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On reopening the document, all annotations reappear
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This behavior is not related to a specific annotation type:
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It occurs for ink, shapes, comments, etc.
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Any single annotation can act as the “last one”
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At least one annotation must remain for deletions to persist
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Expected Behavior
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Deleting all annotations should result in:
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XFDF correctly representing an empty annotation state
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Reopening the document with zero annotations
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Actual Behavior
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When annotation count reaches zero:
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PDFDoc.FDFExtract(e_annots_only).SaveAsXFDF()does not reflect deletions -
The last annotation appears to be deleted visually but is not persisted
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XFDF export does not represent the “all annotations deleted” state
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Reproduction Steps
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Open a PDF with multiple annotations
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Erase all annotations
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Save annotations using XFDF export
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Reload document / reapply XFDF
Result:
All annotations reappear
Control case:
If at least one annotation remains → deletions persist correctly
