This kind of problem is complicated and is affected by many factors. You may try the steps below to fix it:
1. Turn off your phone's WiFi and turn it on again.
2. Restart your phone.
3. Enter your phone's WiFi settings to delete the PLAUD WiFi.
If the problem still persists, please submit a ticket here and provide the info below:
1. The exact error you saw on the PLAUD App when the fast transfer failed. It would be better to take a video of the failure.
2. Export the App log. You can refer to https://support.plaud.ai/hc/en-us/articles/11053740816655-How-do-I-export-the-App-log.