My database comprised 7 forms with the following number of records:
1) 168
2) 721
3) 1765
4) 42
5) 59
6) 132
7) 38
1 and 2 migrated successfully.
Around 700 files migrated from 3.
No records migrated from 4, 5, 6 and 7.
I tried several times. A varying number of records were migrated from 3, none were ever migrated from 4, 5, 6 and 7.
I tried an alternative, importing forms in csv format. This worked for 4, 5, 6 and 7. With form 3, it transferred 1289 forms.
This is the best I’ve achieved, leaving me to manually copy 476 records.
Not too good, really, and I followed the instructions to the letter, as well as reading the FAQ and comments here.