WeChat Mini Programs can not play the downloaded video, how to solve it?

use the downloaded file from downloadFile to add the path to the video src, but it can"t be played on the phone.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eacd7a-2109.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eacd7a-2109.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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