Upload attachment crashes

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When I use the file manager to upload an attachment, I will log back in and return to the home page. From the network console, I can see that the status code of the uploaded request is 403, but I save a blank form first, and then I can upload it. This form and the attachment are a pair many associations   After clicking, it flashes back to the home page, and the microflow is not executed, because the log is not output at the beginning
asked
2 answers
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There is no problem deploying the same code in a new environment, and there will be problems after a while

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403 usually means forbidden. Does the user have the correct entity access?

answered