Can anyone tell me why sometimes when I 上传 图片 onto 潮流粉丝俱乐部 it allows me to 上传 unlimeted 图片 at a time and other times it only allows 20 at a time?

What I understand is that the number of 图片 你 can 上传 is determined, in part, 由 the medal 你 have achieved in the particular club. So if 你 have a fanatic 粉丝 medal in one club, 你 may be able to 上传 更多 图片 than a club for which 你 were a dedicated 粉丝 或者 for which 你 had no medal at all (I believe that, with no medals, an user is limited to 10 图片 at a time). Sadly, this sort of rewards bulk uploading with even 更多 bulk uploading, but what are 你 gonna do?