PS but note the disparities in naming conventions, for the 3 sets that I have been copying from device to device:
Startdir is C:\Dropbox\epub related\fonts
|-- \
| |-- Bookerly-Bold.ttf
| |-- Bookerly-BoldItalic.ttf
| |-- Bookerly-Regular.ttf
| |-- Bookerly-RegularItalic.ttf
| |-- Caecilia.ttf
| |-- Caecilia-Bold.ttf
| |-- Caecilia-BoldItalic.ttf
| |-- Caecilia-Italic.ttf
| |-- DroidSerif-Bold.ttf
| |-- DroidSerif-BoldItalic.ttf
| |-- DroidSerif-Italic.ttf
| |-- DroidSerif-Regular.ttf
these names are as found in system font folders, not edited
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