The reasons why qq music is shared to Weibo without a cover are as follows:

1. Network problem: The upload of the cover image fails due to unstable network or busy Weibo server. You can try Reshare or try again later.

2. Personal privacy settings: If the privacy settings of personal Weibo are high, the cover image cannot be shared normally. You can try adjusting privacy settings or changing Weibo accounts to share.

3. QQ Music version problem: The older version of QQ Music is used, and there are some incompatibilities or bugs that prevent the cover image from being shared normally. You can try to update or uninstall and reinstall QQ Music.