New answers tagged compression
After doing some digging on other peoples cover images it seems that the theory of keeping it under 100Kb is best ignored. An image of 1500x500 (Twitters banner size) and under 1Mb seems to work well on desktop and only have minor pixilation on mobile.
A quick fix for now would be to use your Photoshop PDF, then apply hyperlinks using Acrobat Pro. This is found in the edit PDF menu.
If you need a quick solution maybe this online reducer can help. http://smallpdf.com/compress-pdf
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