Hello Tom Tyrrell:
Thank you for using our NFC community.
Are you using the latest version of the TagWriter app? Until now the latest release is v3.7.51.
Not sure if there is an actual limit, but I tried with an Android device and did not found such limitation, I could successfully read more than 44 CSV entries and store them in NTAG216 tags.
Please try with the latest version of the app or even with a different Android device in case you have one at hand.
Best Regards!,
Jorge Gonzalez
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