The App Menu contains information to help you get the most out of OmniOutliner and settings for customizing your OmniOutliner experience. Tap in the toolbar on the Locations Screen or when viewing the contents of a folder in the Document Browser to access it. See The App Menu for more details.
Contextual Menus
Since iOS doesn't have a menu structure similar to macOS, OmniOutliner uses contextual menus to provide a method of interacting with the user interface. Where available, contextual menus appear when you touch and hold on an object and then release your finger. Contextual menus appear as a black bar—with menu options specific to the object or interface element you have tapped.
If a contextual menu has additional options, you will see an arrow on the right edge of the menu; tap to reveal the additional menu options. After scrolling the menu to the right, a appears on the left edge of the contextual menu so you can scroll back to the previous set of options.
Document
OmniOutliner 3 for iOS creates two different types of documents. Outlines (with the file extension .ooutline) represent structured writing or other data, and are the primary document type. Templates (with the file extension .otemplate) are the other type, used to store style presets or other document attributes you might frequently reuse.
The file browser that OmniOutliner uses to help you manage OmniOutliner outlines and templates. The document browser also provides access to files stored on your device, files in the cloud (via the iOS Files app), and files synced with OmniPresence to Omni Sync Server or a WebDAV server.
Drag & Drop
Introduced with iOS 11, Drag & Drop is a system-level function that’s integrated with OmniOutliner and other apps on iOS. You can drag into OmniOutliner from the Files app and other apps, reorder items in the outline, as well as drag rows or selected text from an open OmniOutliner file to other apps on your device.
Files
The Files app, introduced with iOS 11, offers a way to access files in local app directories, as well as those in the cloud. You can copy files to the local app directory, tap OmniOutliner files to open them in OmniOutliner, and also drag from OmniOutliner into the Files app.
Inspector
The inspector is a sidebar full of controls used to define custom properties of selected rows or text, set up styles to apply throughout your outline, and set document parameters for saving and adding metadata to your OmniOutliner documents. The controls are contained in two separate tabs (the Selection and Document inspectors respectively).
Keyboard Shortcut
A set of keys pressed to invoke a menu command, available when a Bluetooth keyboard is paired with your device. Press and hold command (⌘) to see a list of shortcuts available from your current location in the app.
Omni Automation
A method of scripting OmniOutliner with JavaScript. See the Omni Automation website for more information on this feature.
Outline
A document with one or more rows, and at least one column, with cells created by their intersection. Outline rows can be nested hierarchically and easily reordered by touching and holding their row handles and dragging them to another location in the document.
Plug-In
An Omni Automation Plug-In can contain a collection of scripts, libraries, and assets. For more information, see the Omni Automation website.
Template
An OmniOutliner file type that contains the base settings such as the row styles, background colors, or numbering used when creating a OmniOutliner outline. Templates can also include outline content, which is used as the basis for documents newly created using the template chooser. (Templates applied to existing documents do not add this outline content.)
Toolbar
The region along the top of the document browser (and outline, when editing a document) is the toolbar. The toolbar contains controls for adding to and modifying the content of the current view—whether adding new documents in the document browser, navigating to other file locations, or using the sidebar and inspectors to edit the contents of an outline.
in the toolbar on the Locations Screen or when viewing the contents of a folder in the Document Browser to access it. See The App Menu for more details.
to reveal the additional menu options. After scrolling the menu to the right, a 
appears on the left edge of the contextual menu so you can scroll back to the previous set of options.
is a sidebar full of controls used to define custom properties of selected rows or text, set up styles to apply throughout your outline, and set document parameters for saving and adding metadata to your OmniOutliner documents. The controls are contained in two separate tabs (the Selection and Document inspectors respectively).