Preparation steps
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Open DevTools in the browser, then press F12 on Windows or fn + F12 on macOS.
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Open the Network tab. If you don’t see it, click the >> symbol at the end of the row.
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Enable Preserve log & Disable cache
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From within the devtools, open the console drawer. Click the vertical ellipsis symbol and choose Show console drawer
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Your devtools should look like this
Reproducing steps & download files
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After your devtools is ready, you can redo all steps you’d made to reproduce the issues/bugs.
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Then click the head-down arrow button to download the HAR file
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Right-click in the console area and choose Save as… to save the log