Where are attachments stored?
There are two different kinds of attachments. One is for tasks and the other one is for events.
Tasks: The attachments are stored in users‘ private iCloud account Events: They are stored in a public iCloud database The reasons behind this implementation are:
Tasks are the primary content in Sorted³ and they are stored inside the app and if iCloud Sync is turned on they are stored in the users private iCloud.
When we take a look at events they are stored in their own calendar app, like Apple Calendar, Google Calendar, Outlook, etc.
Events can be created in a shared calendar and notes and attachments inside events are shared as well.
In order to make this as easy as possible, attachments are stored in a public database and they will be deleted after 15 days (counting from the start date of the event).
If a user added something to an event which is shared as well others can see it. Thus there is a URL starting with file.staysorted.com to access them.
With all this in mind we suggest not to store sensitive attachments in events
If you need to access them in the long run they should be added to tasks not events.
Please keep in mind there is a file size limit of 10MB for attachments in events.