Tools
Scan a folder of comics you already have. Issuarr matches the files to series on ComicVine and lists them under Import results, where you choose what to add.
Process a folder of downloads by hand, for example after a client finished outside Issuarr. Files of series in your library are renamed and moved with your post-processing settings. Everything else stays in the folder.
Save lists of your library as CSV files in Issuarr's data folder (/config/mylar).
Export
Columns: series name, series year, issue number, issue date, ComicID, IssueID.