i donāt want to start this old apple-discussion again like when i needed to learn coping with their company-behaviour. as if they wouldnāt earn enough buckazoids already. 
Can confirm, replicated this just now:
One thing Iām not sure about, is I see there is a repo out by nokiatech on heif and thereās supposedly an open source (though doesnāt appear to be very libre) repo for heif reading/writing/etc. I donāt know all the licensing logistics between this and AGPL, but I wonder if there arenāt any conflicts of interest or license breaches having some sort of conversion built into the server or client for heic? Or I also saw that iOS 11 has the ability to auto detect whether to export as an heif file or the more compatible jpeg & mov files. Perhaps thereās some sort of tie that Nextcloud can take advantage of with either one of those two implementations? Iād assume the latter could be easier or at least more respecting of the openness of the Nextcloud platform
So itās heavily patented, I guess we wonāt be seeing support in NC for this - and tbh Iām not totally disappointed by that; itās simple enough to turn it off in iOS āat the momentā
@ios is it worth putting a warning up on the next update?
i just noticed this while i was checking the photos that were uploaded to my cloud server.
seems to be that if im checking the pictures in the ios app, the HEIC and HEIF work normally, only the web version of the server seems to be affected.
Hopefully on the next update of NextCloud will be able to preview them on the web browser as normal as jpegs.
By the way, im on version 11.0.5
On a positive noteā¦
During the initial beta stage of iOS 11, google photos was unable to backup the heic files, but during the final iOS beta stages, google photos did an update and now the files are in and are still .heic files, so I can view them, print them, they are treated the same as when it was jpg files through the photos.google.com.
So, I believe it is a possibility to see the same in nextcloud.
This is under study.
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this website can help you convert the .heic to jpg: http://heictojpg.com/
also, just tested that when using icloud to sync to photos in a mac, the file gets converted to jpeg.
Also, if you download the .heic into your mac, it will not be recognized or able to be imported into photos.
I think with the jankiness of HEIF (and as stated earlier all the patents and non-libre focus of HEIF), it would cause issues with this project which sucks. @ios Does Apple offer a way to tell iOS to switch over to jpeg & mov for that specific app? That way, if users were wanting to take advantage of HEIF on iOS, they could do that and then have Nextcloud sync as jpeg and mov as usual
Iāve turned my heic feature off on my iPhone camera for now, but look forward to a preview option in the app. I do like the idea of increased compression for photos stored on the phone and it would be cool to have a previewer built into nextcloud and convert it to jpg when syncing.
A tiny and free desktop app for Mac and PC which lets you convert Appleās new iOS 11 photos from HEIC to JPG or PNG. Enjoy!
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Good catch!
The HEIC file format seems to break the auto upload feature on my phone, so those pictures werenāt even in my nextcloud in the first place. After seeing this post I had to manually select all photos from the last month and āshareā the image using the IOS share feature, which then converted them, and selecting to upload to nextcloud.
Weāll probably rely on general Linux and PHP libraries that enable this for the server, so thatāll take a while. The ecosystem as a whole has to move forward with itā¦ Eg when most image viewers support it out of the box and when browsers do, we will. Until then - well, one could build an app for it with javascript or so of courseā¦
Makes perfect sense.
Iāve changed my iOS settings and donāt expect to think about it again until
I hear about HEIC support from a nextcloud patch note 
With the v 2.18.0 of Nextcloud iOS (in beta) you will be able to choose to save the image UTI public.heic in jpg without external program and without loss of definition.
Cheers
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Is there a way to install the Beta ios app?
Marked @iosā reply as a solution. For NC preview support I suggest creating a new topic and raising it as a feature request on GitHub.