We recommend that the total size of the attachments together should not exceed 20MB.
From now on you are able to import activities via mail. Why would you do that? Some apps can export activities to different file formats, but do not support direct export to Runalyze. You can use this feature to easily send your activities to Runalyze from those apps. What do I have to do? Activity import via mail is deactivated by default. At Configuration -> Import you can activate this feature. Additionally, a pin/password, which can be kept quite simple, must be entered. How does it work? You send a mail from the mail address you used to register with Runalyze to firstname.lastname@example.org. The subject must contain the specified pin/password. You can simply attach the activity(s). Are there limitations?