To save data as a csv file in Graphical Analysis 4 on iOS, choose Export–>.csv from the File menu. You will be asked to choose the decimal format, then name the file.
The file is now saved locally on your device.
To move it, you can use your device’s built-in e-mail program to send the file as an attachment. On selecting “Add Attachment” you will see a list of Locations. Choose “On My iPhone (or iPad),” then the “Graphical” folder. Once you are in that folder, choose your file. The file will be added to your email as an attachment.
Alternatively, you can use the “Files” app installed as a part of iOS.
On launching Files, you will see a list of Locations. Choose “On My iPhone (or iPad),” then the “Graphical” folder. Once you are in that folder, choose Select in the upper right corner, then choose your file(s). The Share button should now be available in the lower left corner. Use the iOS Share sheet to direct your file to the desired location, including an email message.