I had a lot of trouble with some Kenro transparent pages, most especially with 135, where the films (different B&W) would not go into the windows from the side. I then purchased the opaque ones, glassine type, and find them much easier. Of course, the glassine ones are not as good for inspection or printing/scanning, so I was wondering if all brands are the same with ref to loading (archival qualities not so important here).
And if all the clear files are similar, is there some trick to getting B&W negs into the sleeves? I found it next to impossible and wondered how people did it? My negs are always dry, usually 24hrs, in normal humidity.