Add all_files to support multiple file uploads in names ending with [… #402

Job	Run time
ameba (ubuntu-latest, latest)	1m 6s
format (ubuntu-latest, latest)	17s
test (ubuntu-latest, latest)	2m 58s
format (ubuntu-latest, nightly)	16s
test (ubuntu-latest, nightly)	1m 45s
test (macos-latest, latest)	1m 35s
test (macos-latest, nightly)	1m 27s
test (windows-latest, latest)	2m 32s
test (windows-latest, nightly)	2m 44s
	14m 40s

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