Thank you, Rich.
... Open a terminal and type sudo mount -a just prior to opening the file manager and you should find your file. To open a terminal click on the icon that looks like a computer monitor. If you run into other problems let me know.
I did as you suggested and still could not see my file after going into File Manager.
I tried to go ahead with the install anyway, but am not sure what to answer to the question "Use Tiny Core from running install or iso file (r/i)" and, if I answer "i", what to answer to the question following that.
Additionally, at a loss what to answer to "Enter path only to bzImage and tinycore.gz or microcore.gz". No matter what I input the installer tells me it cannot find the system files bzImage etc. I tried both /mnt/sdb1/boot (my pen drive) and /mnt/sr0/boot (the Tiny Core iso CD).
Oh, almost forgot: after going back to my normal Ubuntu, found out that the installer had added "mydata.tgz" to the pen drive.
Thank you again for the help.