The Cloud version works a bit differently from the local version of Planning Analytics. Planning Analytics on Cloud will only pick up csv from the shared folder (\\data\s..);
When you define the csv data directory make sure ‘Data source name’ is be different from ‘data source name on the server’. For example, if you create a folder name DATA_SOURCE in the server data folder (i.e., tm1).
Data source name will be:
Data Source Name: \\data\s\prod\tm1\DATA_SOURCE\xxx.csv
Your data source name should be relative to be directory
..\DATA_SOURCE\xxx.csv
Use ..\ if the file is within the same folder with ‘data’ folder.
Use .\ if the file is located in the ‘data’ folder.
For more information refer to IBM KB Article below: