Issue Description
I have implemented a document management feature in Perspective where PDF files are uploaded to:
C:\Program Files\Inductive Automation\Ignition\webserver\webapps\main\Documents\
The PDFs can be uploaded, viewed, updated, and accessed successfully.
However, after a PDF is viewed through either the Perspective PDF Viewer component, an IFrame,
or even a browser tab, the file cannot be deleted from the server.
The delete operation returns errors such as:
unlink(): an unknown error occurred
or Windows reports that the file is being used by java.exe.
Findings
The file exists and the path is correct.
Upload functionality work as expected.
The file can be renamed successfully even after being viewed.
The issue occurs specifically when attempting to delete the PDF after it has been opened.
Files that have never been viewed can be deleted without any issue.
Questions:
1.Has anyone experienced PDF files being retained/locked by the Perspective PDF Viewer or Ignition web server after viewing?
2.Is there a recommended approach for serving PDFs that allows reliable deletion and replacement of files?
3.Would using Web Dev or serving files from a location outside webapps/main avoid this behavior?
Any guidance or best practices would be appreciated. Thank you.