We used to save csv files in ODK folder which is created automatically when download kobocollect v1.28.0 and there was no issue with that version.Unfortunately problem starts with the app when it is updated to new version like " kobocollect v.29.3 " i.e ODK folder is not found in phone storage.
@libtech_2020, the path may change with the device model but i could trace it in my Samsung device here:
Phone\Android\data\org.koboc.collect.android\files\forms\Pull Data for Dates xls-media
Here, i had a survey project named Pull Data for Dates.xls so i had to create a folder named Pull Data for Dates xls-media manually. Inside this folder i pasted my csv file and it worked (i.e. i could link my csv data with the survey project without any issue.
The best and easy option to track this path would be as follows:
Create a survey project that requires a csv file.
Upload and deploy the same.
Then press Get Blank Form in your KoBoCollect android app.
There you should be able to get both your survey form as well as the csv file.
Now open your internal storage and trace for the survey project. You should be able to find it in the path similar to the one i shared above.