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I'm encountering an issue where the lightning-file-upload component used on an LWR (Lightning Web Runtime) site fails to upload files when the site page is accessed by guest users using Firefox. The upload gets stuck during the first file (whether it’s a single or multi-file upload), and the Done button remains disabled, preventing submission.

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This issue appears to be specific to Firefox and does not occur in Chrome or other browsers. We’ve confirmed that the following setting is enabled in our org:

Setup → General Settings → Use the File Upload Lightning web component for LWR sites Setup → General Settings → Allow site guest users to upload files Has anyone else faced this issue? Is there a known workaround or browser-specific limitation for guest users using lightning-file-upload on LWR sites in Firefox?

Any guidance or suggestions would be greatly appreciated.

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    Do you see any errors in the console? Press ctrl+shift+i to open the dev tools, then click the console tab. You might also check the network tab for failed requests. Commented Jul 7 at 7:56
  • Did u config any custom logic on contentversionhandler which is specific to the guest user? when we test as guest user in a experience site, make sure you do not visit the portal using your admin session, somehow it got into this trap after you visited experience builder as admin Commented Jul 8 at 8:52
  • There is no error in the console and also no failed requests in network tab. Also there is no custom logic on any object related to files (content version, content document etc..). When I turn off the Lightning Web Security from Site builder > Settings > Security and Privacy - Then it works fine. Commented Jul 8 at 9:12

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