Tool to identify all filepaths/filenames exceeding Windows' allowed length?

I have a folder containing several nested subfolders. The parent folder is 1.2GB, and contains nearly **3,000 mainly screenshot image files**. My Mac doesn't have a problem with the long filepaths/names obvs, but I now need to share these files with a very large **UK Authority running Windows** (not sure which version, as my Q has fallen on deaf ears so far...) I think the only method I will be allowed to share the files by is OneDrive/Sharepoint - the Authority is restricted from using any other Cloud sharing method. Due to the nesting (which has to stay) **many of the filenames/paths are too long, and One Drive is repeatedly rejecting over 1,200 of them without syncing.** Pop-up error box only shows one offending filepath, helpfully doesn't offer a list of 'non-compliant' files. **Is there a quick way of identifying and grouping the offending filenames/filepath names together so as I can rename them?** I don't want to *batch* rename them in case that alters the meaning I've chosen for the individual file names, which are important. Over 95% of the files are image-only files and evidence in an employee fraud investigation. Each filename is important as it gives *context to the image*, hence me not wanting to use a batch tool to change the names to something shorter but unhelpful. I don't mind going through them one by one, but need to know *which* are the 'offending' filenames/filepaths if I'm to do so. It may be that I can also nest the folders slightly differently if I know which ones are causing the problems, as that may reduce the filepath length. **Ideally I'm seeking a canny bit of software similar to MassReplaceIt** (which I've already used to find and replace 'illegal characters' in the filenames) but can use terminal command if no software exists. Thanks!