Today my forum logo disappeared from the iOS app. It’s exactly the same as in Mobile: Site logo disappeared in iOS mobile app and I suspect that the same solution will work - ie removing and adding the forum. But I wonder what caused it. Could it be related to rebuilding the app earlier today (see "Your Droplet is nearing its memory capacity" email - #6 by Jonathan5)? Might it just right itself given time?
Potential solution from the topic you linked:
I’d spotted that 
Unfortunately I’ve just tried it and it didn’t work.
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The logo in the app is pulled from the apple_touch_icon_url entry in your site’s /site/basic-info.json endpoint. Can you check whether that URL is correctly returning a logo? If not, you need to fix that in your instance, and then quit/restart the app.
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Yes, it does.
I don’t have an apple touch icon set, but it takes it from one of the other icons that is set.
Do you mind posting the URL to your site here so I can test as well.
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Go into admin > settings > branding and reupload your logos that are greyed out.
Had the same issue with one of my sites.
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If your site has working HTTPS, you can also enable “force https” in your site settings. This resolved many issues with my site images/logos, but these were also mixed content warnings in Chrome. Might help.
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I set force https, then removed and added the app, but it made no difference to apple_touch_icon_url in /site/basic-info.json and no difference to the iOS app.
Tonight I’ll try rebuilding the app. I wonder what went wrong, as it was all working for nearly a year until today. Today was the first time I rebuilt the app without it being an upgrade. I suspect that with force https it will create all the icon URLs from scratch with https instead of http. It’s a bit odd that force https wasn’t set to begin with (before I uploaded the icons the first time).
If that doesn’t work I’ll just upload the icons again. I guess that will reset the URLs for all the icons including the apple touch one (which is based on the standard one).
Thanks for all the advice.
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I think it turns it on automatically if you have an email set in the LETSENCRYPT_EMAIL field of your app.yml. I did not but I had a wildcard SSL from the domain, so I used that instead.
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On ssllabs.com it shows the certificate as valid from this morning, a couple of hours before the Discourse rebuild. Might that be relevant? I set up the Let’s Encrypt certificate separately for the forum subdomain than for the rest of the site.
Update. My forum has just given me my one-year “Anniversary” badge. Maybe it was all just something to do with the Let’s Encrypt certificate getting renewed today.
I rebuilt the app and, after removing the forum from the app and adding it again, it’s working now!
…“apple_touch_icon_url”:"https://forum…
Who knows whether it was by rebuilding the app again or changing the force https setting…
Maybe that setting will prevent it happening again though.
Thanks again everyone.
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When all else fails, ./launcher rebuild app
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