If you are trying to import the same file into a list as well as a module, make sure that the name of the file is same for both instance ie. In Actions tab--> Go to Imports and check for the Source Label of both actions. If it is same then put those actions into a Process, you will be asked to import the file only once instead two.
Note: Even though if the stucture of the files are same, Anaplan will refer only the source file name.
Hope you understand the risk of naming conventions while uploading a file :)