Most mobile devices do not have a file management system like your computer, so you will need to file your readings in an app. The following apps help you sort and manage readings on your mobile devices, as well as access the readings from other apps, computers and devices.
Cloud storage apps let you sort your documents and readings into folders, and let you access your files from other computers and devices.
Tip: you need to make sure that you choose an annotation app that can open documents from, and save documents to, your cloud storage app.
Some annotation apps (such as GoodReader) allow you to store and manage your documents and readings in the app. This can make it simpler to review your readings, and search your notes and annotations. However, it can mean that your readings and notes can only be accessed by your mobile device.
Tip: most annotation apps that provide file management, or store more than one or two documents, cost money.
You can manage readings in a reference management app such as EndNote or Mendeley. These will let you collect the bibliographic details that you need when referencing your readings, and can synchronise the details with the web or desktop versions of the software.
The annotation tools let you highlight and add notes, and the annotations are retained when the documents are synchronised with the online versions.