Hi Crisprr,
Thanks for reaching out using Apple Support Communities. Here to help.
It sounds like you are trying to locate a file that may have been saved to iCloud.
We're not familiar with the app you are referring to, but we can provide information on how to access files stored in iCloud Drive in case this is where your export file was saved to.
First, lets discuss the application called Files. Files is preinstalled on iOS devices and allows users to manage files locally on a device as well as cloud services. Files allows you to browse locations for files or use search terms to locate files. This is where we would suggest looking first.
Use the Files app on your iPhone, iPad, or iPod touch
If enabled on your device, iCloud Drive may be accessible through the Files app. iCloud Drive can also be accessed through a web browser at iCloud.com Further information can be found about iCloud Drive at the link below.
Access iCloud Drive files from your iPhone and other devices
If the file you are looking for was saved to your device, using the Files app to check local and cloud storage locations would be how to locate your file. If you aren't seeing the file you are looking for, you may want to export it again or work with the app developer.
Hope this helps! Take care for now