Graphical Analysis GW for iOS devices supports the import of the following file types:
LabQuest (qmbl)
Logger Pro 3 (cmbl)
Logger Lite (gmbl)
Graphical Analysis 3 (ga3)
CSV files

Notes:
Calculated columns are only supported in LabQuest (qmbl) files
Graphical Analysis 4 files (ambl) cannot be imported directly. Instead, export the data as a CSV file.

Related:
When I tap on an email attachment to open it in Graphical Analysis GW for iOS, it doesn't work.
How do I import a data file in Graphical Analysis GW for iOS?