1. You can check if the attachment format meets the requirements; currently, only 'jpg', 'jpeg', 'png', 'webp', and 'pdf' files are supported.
2.The maximum file size supported is 20MB.
3.Switching apps, answering a phone call, or locking the screen, which causes a network connection interruption, may lead to upload failure.
4. Unstable network speed can also cause upload failure.
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