Canon Powershot SX70 HS is not yet supported.
See: Release darktable 3.8.0 released · darktable-org/darktable · GitHub
current master supports this camera, you might use the development build in current OSX Build - #431 by MStraeten
(backup your ~.config/darktable directory and as well you local saved xmp files since there’s no way back for once edited files.)
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