Enable plug-ins
Use plug-ins only from trusted sources (preferably plug-ins that are digitally signed by their developers), because plug-ins can access and modify your custom app and connect to other services over the internet.
For additional security and to prevent unauthorized plug-ins from being installed, FileMaker Pro users can enable or disable the installation of plug-in files. This is an application preference, not a file preference, and determines whether plug-ins can be installed on the user's computer.
If a plug-in is enabled, FileMaker Pro attempts to load the plug-in after it is installed and whenever FileMaker Pro starts. If FileMaker Pro can't verify the plug-in's digital signature, or if the plug-in hasn't been signed, the user is notified and can choose whether to load the plug-in. If the user chooses to always load the plug-in, this preference is saved in the user's application preferences, not in the file.
See "Setting plug-in preferences" and "Setting permitted hosts and plug-ins preferences" in FileMaker Pro Help. To enable plug-ins on a host, see Enable plug-ins in FileMaker Server.
Notes
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Plug-ins are not supported in FileMaker Cloud.