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Can I see a screenshot showing how the original symptom looks like for a technical review?
Do you mean your Mac crashes when uploading a file to ehre?
You may try clear web history and website data then try it again.
Or, you may upload the files to anywhere in the cloud storage such as OneDrive or Google Drive or Dropbox, then share a download link here for review.
As no further input gathered against my last clarifying question, I now provide a general answer based on the given description and common situations.
As advised, the correct way to troubleshoot has been given in the last message.