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Open you Photoblog in Desktop website and Click on Edit then there is link for Add Cover Image , add the cover image from there. Hope this helps!
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Open your profile >Click on your Cover Photo >Edit >Add Cover image >Browse through files >Upload
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Your solution is for normal trip post I think but in photoblog no place is there for cover pic upload
Click on the cover photo and edit option later browse it from your phone or computer post it
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