Unable to Upload Documents

Really appreciate for making H2O.ai and making it available for the public. Been using H2O.ai for the last 2 weeks however, recently I have encountered an issue towards uploading documents. To be precise on my issue, when I click on 'Add Documents' a new dialogue box opens asking to browse the files to upload and thereafter, when I upload the required documents, the 'Add' button is not working.

Please see the below picture for reference.

Similarly, the 'Add' button within the 'Import from file system' is also not working. Please see the below screenshot for reference.

Please help me out understand the issue, Thank you.