When trying to import tags or multi-select dropdown fields, you can do so by setting them up in the following way:
Tags
Column name needs to be Tagand can have multiple columns named tag
If during import, you ever want to simply import a column as a tag, you can just set the column in the import to "Tag" (can have unlimited fields named this)
Title
Title
Title
Tag
Tag
Tag
Tag Number 3
Tag Number 2
Tag number 3
Multi-Select Dropdown
It must all be 1 column and be broken up by semicolons
You do not need to do anything about spaces
If the value field ends with an ";" then you will need to "Fix" the value and assign it to another dropdown value. If the "Fix" field is labeled "--" then you can set it to any existing dropdown value, it will not actually add it.