Thanks in advance for any help you can provide...
(I'm not sure of software versions of each, but) Before updating to the latest iOS, 10.2.1, and the latest Collector for ArcGIS, 10.4.2, Collector was capable of opening another app's URL to a file located in another app. Now it appears that cannot happen in Collector. What has changed? Or am I missing something? The URL link works when it is pasted into the Notes app or the Explorer app.
In our case, we use the GoodReader app as file storage for pdf’s of parcel appraisal fieldcards. GoodReader has the ability for other apps to open pdf’s inside GoodReader, when you click the link (from their website: use Link button to copy a special URL link of a single selected file to clipboard. This URL link will have a special prefix gropen:// and will contain a full internal path to a selected file inside GoodReader's file storage. Any other iOS app that is capable of opening URL links (for example, todo-type or notebook-type app) can use this URL link to automatically launch GoodReader and open a file being linked. For example, you can create a "Read this book" todo task in a todo application and associate an URL link with this task in such a way that tapping this URL link in that other application will launch GoodReader and open this file of interest. If you invoke the Link action with several selected files, several URL links separated by line-breaks will be copied to clipboard.).
The Explorer for ArcGIS app appears to still allow the hyperlinking to the GoodReader app files, but not Collector. The attached screenshots should help indicate the linking issue. Note that a 'http' link will work, but not a link to another app. We need the local URL link (GoodReader) solution to work in a disconnected environment. Again, thanks for any information you can provide.