Uploading images folder from my system into Google Colab
Method 1 :


zip the file 
Upload the zipped file, there is an Upload button under the Files Section.
Unzip it using the command on colab : 
!unzip level_1_test.zip 


Method 2 : 


upload the zip file to the google drive account.
The only difference is in step 2 where in place of the GUI upload option you can run the google code_snippets to upload download your zip file from the google drive to Colab account . 
Unzip it using the command on colab : 
!unzip level_1_test.zip