You can add similar data to an existing dataset from multiple files at a time.
Prerequisites
The files to be upload must conform to the following rules:
The file format is the same as the source file of the dataset.
The columns in the files are the same as the source file.
Each file must contain at least one row of data.
Procedure
On the home page, click the dataset that you want to add source data to.
On the "Dataset summary" page, move your mouse pointer over the source file, and then click
Add files.
In the "Add files" dialog, click
Add files to select the files to be uploaded, or directly drag the files to be uploaded to the
Drop files/folders to upload (or click) area.