"Download a file from shared folder" technique doesn't have an explicit default value for "Compare method" (was mtime, now digest)
The "Download a file from shared folder" technique offers a choice of compare methods to know when to update files: mtime (based on file modification time), digest (based on a hash of the file), binary (byte by byte check), etc.
Currently, because of the layout of the web interface to configure Directives, the first choice in the list is selected "by default", and is "mtime". This causes a lot of issues where a file can be modified by someone on a node, and then Rudder will never update it again because it has a more recent mtime that the one provided by Rudder. This is of course the design intended by the "mtime" option, but does not fit with standard expectations for file copying.
I propose therefore to change the default to "digest", and make it explicit in the technique's metadata.xml.