Why is this PDF file not being uploaded to firebase storage ? all other files are being uploaded .
I think the PDF file is not present on your phone ( If the pdf file is present on your phone then please Show your Blocks )
Use URI encode ( Web Component ) Block and encode your file name and then try again
I think the upload failed because some spaces present in your filename
Where to use this block ? And I also tried by removing the space.
Why are you using so much calculation? 
Try with simpler blocks.
having tried all the ways. The rest of the files are being uploaded all the way.
Sorry for my bad English
Then provide the do it result.
The top is given in the screenshot.