"files" array (returned by useS3Upload()) taking time to update

[nik32]

The problem is that once I make the call the uploadToS3() to upload a file... sometimes it takes a few seconds before the files are added to the "files" array. This is a problem as we are using the files array to communicate to the user that file upload has begun. As there is a few seconds of delay in the communication... the user feels like there was some problem and thus the file did not get uploaded (Which our people feel is not a good UX).

My questions -

1. Why the delay is there?
2. Is there any way to solve this delay so that the user gets instant feedback that his files have started uploading