Unlimited numbers of files are able to be attached with a 30MB total per submission. Required: Application for Section 106 Review Form as well as supplemental materials such as maps, photographs, etc. Note that as of 1/1/2021, the SHPO will only accept requests submitted on the current form: https://www.miplace.org/historic-preservation/programs-and-services/cultural-resource-management-and-planning/section-106-application-changes/
IMPORTANT: File names may not contain any special characters or punctuation besides the period/dot before the file name. Dashes and underscores are acceptable; all other special characters or punctuation must be avoided, including periods in positions other than directly before the file type indicator at the end of the name.