When creating a note, iController gives you the opportunity to add an attachment to the note (on debtor or document level).
Here is a list of extensions which can be uploaded:
'bin',
'bmp',
'bz2',
'csv',
'dat',
'doc',
'docm',
'docx',
'dotm',
'dotx',
'eml',
'emz',
'gif',
'gz',
'htm',
'html',
'ics',
'jpeg',
'jpg',
'json',
'mht',
'msg',
'odg',
'ods',
'odt',
'oft',
'one',
'p7s',
'pdf',
'png',
'pptx',
'rtf',
'svg',
'tif',
'tiff',
'txt',
'vcf',
'xls',
'xlsb',
'xlsm',
'xlsx',
'xlt',
'xml',
'xps',
'zip',