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[Kal_Lam]

@Prem, seems like you are trying to design your XLSForm using the select_one_from_file. In this case, this post discussed previously should help you solve your issue:

Cascading Select and External File

Welcome to the community, @bird_rao! Please be informed that the select_one_from_file should work with both your Web Form as well as Collect android app. Maybe you should also be able to see a workaround discussed previously here: As an alternate, you could also use the select_one_external to cascade your long list of choices as outlined in the post discussed previously: