1
public:// is the sites public file system path. You can change it by navigation to admin/config/media/file-system.
There you can set the public file system path, the default path is sites/default/files.
1
Don't use the default_bundle at all, instead set the bundle type like other field values in the process section:
process:
temp_bundle_type:
plugin: static_map
source: field_list_item_type
map:
card: card
header: header
default_value: card
type: '@temp_bundle_type'
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