iOS 8 introduced sharing extensions.
But what apps show up in what share lists?:
Activation rules tells the system when to offer a particular app's extension. For example, when photos are selected, the activation rules for a photo app would tell iOS that it should be included in the options... [Apps] can and will all have different, if sometimes overlapping activation rules. Developers can indicate their activation rules by using a predicate with as simple or as detailed a query string as is needed. [same article].
I have an App that shares plain text files via the share button. (App is HoursTracker tho I don't think that's relevant).
So I want to search the App Store for an app that "activates" for plain text sharing extension. I don't want a cloud app (eg Dropbox). I've searched for hours, downloaded 20 [free] that seemed like they would, and none of them do.
One could imagine a generalized search function categorizing apps by what they share, and what sharing extensions they provide.
Is there a way?