In my test code, I set the tasks’ hyperlink and hyperlinkaddress to our software hyperlink (i.e. “FPCS://OPEN/TS-A-0000014”) but the hyperlinks are not saved in the MPX file, is there a reason for that?
Please check last post in this thread
https://forum.aspose.com/t/4238
You will find list of fields which are supported by mpx format.
Other fields can be just read from mpp or read and saved to mpd files.
About showing custom fields in gantt chart.
Aspose.Project was designed as tool for reading and writing project data. Additional information which stored in mpp files for graphical representing of projects is not a real project data. I’d be very glad to help you and implement possibility to edit it but binary format of gantt chart is unknown yet.