1. Video is not approved: If the video you uploaded is not approved by BLICK BLICK, then you can't set personalized cards. You need to wait for approval before setting.
2. Do not meet the setting conditions: When setting personalized cards, you need to meet certain conditions, such as video playback volume and number of fans. If your video doesn't meet these conditions, then you can't set personalized cards.
3. Network problem: If your network connection is unstable or the network speed is slow, it may lead to the failure of setting personalized cards for video uploading. You can check whether the network connection is normal, or wait for a while before setting.
In addition, there are other reasons that may lead to setting failure, such as improper operation and system failure. If you encounter problems, you can try uploading the video again or contact the customer service for help.
It should be noted that the conditions and rules for uploading videos and setting personalized cards are constantly changing. You need to pay attention to the official announcements and regulations of Mile Mile and keep abreast of the latest setting requirements.