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There's always SE
As for 3.9 it's the most stable one they have but yes, outdated unfortunately.
Not fond of pf v4 so I can't use it on my sites.
I am happy with the change I made for my author site, to SE. Lots of goodies. Can't change ScriptTechs main site until we figure out what to do with all of those Articles (Tutorials).
I wouldn't laugh at a question as I have had to learn too. Everyone has to learn new things so no question is stupid except the one not asked.
I meant the storage quota in case the member had perhaps gone over the quota you may have set. It's in the Manage > Member Levels section under Member Level Settings.
Most likely your server php settings need to be adjusted for post_max_size and upload_max_filesize http://support.socialengine.com/php/customer/portal/articles/1653006-admin-panel---stats-&gt;-server-information seen in that tutorial.
SocialLoft used to be a third party dev at fox so I would imagine they have a mobile app but don't promote it. Money talks though
I use responsive theme on my site but there are mobile apps and they have good ratings. https://www.socialengine.com/marketplace/categories/mobile
Best thing to do is test anything you want. Make sure there are demos for anything you consider buying and a guarantee.
They are on this site, phpFoxer. If you want, you can tag them and they can come explain their app. I didn't tag them in case you didn't want them to come. There are already discussions about both apps in my archives as well:
and this one to make your own with a wrapper https://scripttechs.com/forum/thread/103/mobile-apps-wrapper-sites-free/