Whether to copy the data in to the project, or leave it in the file.

There are two options available to import data. One is to take a copy of the data from the file into the project. Afterwards, the source file is forgotten: it can be deleted, moved or edited with no effect on the project. This is the best option if you want to access the project from multiple machines.The alternative is to link the file. The source file must be kept afterwards, and any changes will be automatically detected by the project. This is the best option for very large datasets, or if you know the file will have its data changed in future.