Hi Tori,
Sorry for the delay in response.
Would like to inform you that Adobe Acrobat Reader for mobile application has limited support for the PDF form.
As you have mentioned that the drop-down list does not work on the mobile application, could you please let us know how exactly the PDF form was created?
What action is added to the drop-down field?
Is it possible to share the PDF form with us, so we can check it on our end?
You may share the PDF either here or in the private message using the steps mentioned here How to share a file using Adobe Document Cloud.
To initiate the private message, take help of the steps provided in this help link How to reset Acrobat Preference settings to default.
If you have any questions, please let us know.
We will be waiting for your response.
Regards,
Meenakshi