This short but useful document has contributions from Claire Bowern (Yale), Jack Martin (William and Mary), Aida Talic (Illinois), Christian DiCanio (Buffalo), and Emily Gasser (Swarthmore).
You might also be interested in this crowd-sourced Google doc with various kinds of advice about remote fieldwork.
Here’s the citation:
Lupton, D. (editor) (2020) Doing fieldwork in a pandemic (crowd-sourced document). Available at: https://docs.google.com/document/d/1clGjGABB2h2qbduTgfqribHmog9B6P0NvMgVuiHZCl8/edit?ts=5e88ae0a#
Some of the references here are adaptable to linguistic fieldwork, but most are.
Both of these references were found via an episode of Field Notes podcast with Guillem Bellmar, also relevant and worth checking out: