Hmm looks like this file doesn't have a preview we can show you (Sharepoint online, new templates)

%3CLINGO-SUB%20id%3D%22lingo-sub-1035924%22%20slang%3D%22en-US%22%3EHmm%20looks%20like%20this%20file%20doesn't%20have%20a%20preview%20we%20can%20show%20you%20(Sharepoint%20online%2C%20new%20templates)%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1035924%22%20slang%3D%22en-US%22%3E%3CP%3E%3CFONT%3EI%20have%20a%20user%20that%20get%20this%20error%20message%2C%20and%20I%20get%20the%20same.%20I%20have%20test%20from%20different%20computers%20and%20in%20different%20browsers.%3CBR%20%2F%3E%3C%2FFONT%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%3CFONT%3E%3CSPAN%20class%3D%22lia-inline-image-display-wrapper%20lia-image-align-inline%22%20style%3D%22width%3A%20999px%3B%22%3E%3CIMG%20src%3D%22https%3A%2F%2Fgxcuf89792.i.lithium.com%2Ft5%2Fimage%2Fserverpage%2Fimage-id%2F159161iB55D8888E82CC513%2Fimage-size%2Flarge%3Fv%3D1.0%26amp%3Bpx%3D999%22%20alt%3D%22Error%20message.PNG%22%20title%3D%22Error%20message.PNG%22%20%2F%3E%3C%2FSPAN%3E%3C%2FFONT%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3ELook%20to%20be%20some%20of%20the%20same%3A%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%3CA%20href%3D%22https%3A%2F%2Fanswers.microsoft.com%2Fen-us%2Fmsoffice%2Fforum%2Fall%2Fhmm-looks-like-this-file-doesnt-have-a-preview-we%2F4f0028ce-70ad-454d-827a-70288063fd22%3Fpage%3D2%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%22%3Ehttps%3A%2F%2Fanswers.microsoft.com%2Fen-us%2Fmsoffice%2Fforum%2Fall%2Fhmm-looks-like-this-file-doesnt-have-a-preview-we%2F4f0028ce-70ad-454d-827a-70288063fd22%3Fpage%3D2%3C%2FA%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%3CA%20href%3D%22https%3A%2F%2Fanswers.microsoft.com%2Fen-us%2Fmsoffice%2Fforum%2Fall%2Fhmm-looks-like-this-file-doesnt-have-a-preview-we%2Fd08df0be-172b-40c6-83a5-e463c3b5e0fa%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%22%3Ehttps%3A%2F%2Fanswers.microsoft.com%2Fen-us%2Fmsoffice%2Fforum%2Fall%2Fhmm-looks-like-this-file-doesnt-have-a-preview-we%2Fd08df0be-172b-40c6-83a5-e463c3b5e0fa%3C%2FA%3E%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1035924%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3ESharePoint%20Online%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-2503571%22%20slang%3D%22en-US%22%3ERe%3A%20Hmm%20looks%20like%20this%20file%20doesn't%20have%20a%20preview%20we%20can%20show%20you%20(Sharepoint%20online%2C%20new%20templa%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2503571%22%20slang%3D%22en-US%22%3E%3CP%3Eours%20was%20a%20view%20display%20box%20not%20checked%26nbsp%3B%20type%20(icon%20linked%20to%20document)....%26nbsp%3B%20%26nbsp%3Bchecking%20that%20box%20caused%20the%20icons%20to%20change%20back%20to%20the%20red%20pdf%20icon%20and%20view%20on%20the%20first%20click.%26nbsp%3B%20%26nbsp%3B%26nbsp%3B%3C%2FP%3E%3CP%3Ego%20into%20edit%20the%20view%20scroll%20down%20and%20find%20that%20field.%26nbsp%3B%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E
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ours was a view display box not checked  type (icon linked to document)....   checking that box caused the icons to change back to the red pdf icon and view on the first click.    

go into edit the view scroll down and find that field.