The OneDrive app lets you upload your pictures and download any files you have at OneDrive.com.

1.       Go to the Apple App store in iOS and search for Microsoft OneDrive, then tap Get.
2.       The application will download and install. When completed tap Open to log into the application.
3.       Sign in by entering your email Office 365 work or school account and click on next with left arrow icon besides the email address.
4.       Enter your email password and tap Sign in.
5.       Your credentials will be confirmed and your account will be set up.

     To add an additional account,

6.       Tap your picture or the icon at the top left of the app.
7.       Click on Add Account.
8.       Enter email address Office 365 of work, school or personal and email’s password
9.       Your credentials will be confirmed and your account will be set up.

Notes:

• For you to sign in to OneDrive for Business, your organization needs to have a qualifying SharePoint Online or Office 365 business subscription plan, or your organization needs to have its own SharePoint Server deployment.
• You cannot sign in with multiple work or school accounts from the same organization.