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获取到了封面，但是在上传的时候就报'"uploadFile:fail Cannot read property '0' of null"'
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https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000c8a7f7981300de486c7e925b000&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=00024c2b5f05486c13a6bde5356000&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000e6c3720c890f941a6fe61c5b800&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000822e44bcda0bed9a6e56835b800&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=00024ac23443785bf7665b2b75b000&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=0000c4098d06b02de456933f357800&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=af7e83ac0caf45c139abecdd8a29caa5&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=3af631abac282ad764c857adf6c7e0c5&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=ed047228027271430cb0f913faf32e38&highline=chooseVideo
大家都有这个问题，请官方解决一下吧
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https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000c8a7f7981300de486c7e925b000&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=00024c2b5f05486c13a6bde5356000&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000e6c3720c890f941a6fe61c5b800&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000822e44bcda0bed9a6e56835b800&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=00024ac23443785bf7665b2b75b000&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=0000c4098d06b02de456933f357800&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=af7e83ac0caf45c139abecdd8a29caa5&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=3af631abac282ad764c857adf6c7e0c5&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=ed047228027271430cb0f913faf32e38&highline=chooseVideo
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=000822e44bcda0bed9a6e56835b800&highline=chooseVideo
大家都有这个问题，请官方解决一下吧