@pulsar33 So far, I have continued to use the method I initially described whereby I copy the files to be transferred into .local/share/wifitransfer.sil and then use wifitransfer to move them from the tablet to the laptop. I didn't have the courage to try your suggestions as I felt that this would be taking me out of my comfort zone and I would be risking screwing up my Ubports system. For example, I didn't recognize "filezilla". The file manager on my laptop is nautilus. I use my tablet as a daily driver as it's more convenient for web browsing and messaging etc than my laptop. I'm typing this reply on my Ubports M10 tablet. Anyway, many thanks for taking the trouble to reply. Your suggestions were appreciated but just a bit too scary for me to be prepared to experiment with.
You mentioned samba. I use samba to move files between my laptop and my desktop PC. I've no idea if samba is installed on my tablet. However, I've noted that the UT file manager crashes whenever I select the network option. That's what originally prompted me to try wifitransfer.