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1. For e-mails however the correct word is: прикреплять = attach
2. I should conclude that you Russians avoid the use of the word: ассоциировать
3. Also something no related with the general...

1.Let's include in our analysis also the verb: присоединять
e.g. Причиной стала его антивоенная заметка в газете «Ведомости» от 1 марта этого года, где профессор отмечал черты сходства в отношениях...

Can someone please help me to detect their difference, through examples.
Based on my general understanding they both mean: connect and unite.
There is also is the verb сочетать which means...