Size limit on RTF files being sent to DTTG

Is there a size limit?
It’s not so long ago I had an RTF file in DTPO on my MacBook that was about 2MB and I synced it to DTTG no problem.
Now, I have had to split that file into four, each about 400KB, and they are still crashing or not showing.
Is there a maximum size for DTTG at the moment?
It would take me a long time to guess and keep splitting them into smaller and smaller sizes, till it shows up and doesn’t crash.
If you know for certain, that would be most appreciated.

There’s no size limit, the only limitation is the available memory. Which iPhone/iPad do you use?