Welcome, @S_Harini_N_Pillai
We had another recent question about the Qiime2 data loading tool that creates the initial artifact, please see the instructions I wrote up there ā Cannot get QIIME2 artifact to work
The important parts are how the files are named. You can adjust that before loading the data to Galaxy, or after it is loaded into Galaxy. Then create a paired-end collection (if that is the type of data your have).
Hope this helps! 