Overall, the DER designed to support and enhance the mentorship practices of RNs was deemed satisfactory by the participants in terms of technological and instructional design aspects, such as layout, ease of use, and relevance of content. Moreover, the flexibility and accessibility offered by the DER allowed the participants to navigate the resource easily and to read and re-read at their own pace based on their own preferences and needs [
5,
50]. Both technological and instructional design aspects are vital dimensions not only in accessing and using a DER but also in motivating mentors to engage with the content in the resource [
20]. Technological aspects such as ease of use and knowledge on how to use applied technology have been rated as the most significant influencing enablers for integration of digital resources as didactic tools in mentorship [
18,
19]. However, our findings highlight the importance of individual and contextual factors constricting the DER usability in clinical education in nursing homes. These factors included the lack of allocated time to supervise, characteristics of RN mentors (e.g. background, mentoring experience, digital literacy), and characteristics of nursing students and nurse educators (e.g. lack of interest, learning engagement, and DER familiarity). Several participants reported using the DER mostly at the beginning of the placement period, with the lack of allocated time to supervise students as an explanatory factor reducing the DER usage. Mirroring previous reports [
1,
9], the findings call for a stronger leadership commitment and acknowledgement of the influential role of RN mentors by allocating time for student supervision. Moreover, the lack of interest and engagement of students in their own learning and lack of familiarity of the nurse educators with the DER appeared to limit the motivation and thus the use of the digital resource among the RN mentors. Some participants also experienced difficulties in using the DER in particularly challenging mentoring situations. These findings indicate that usability related to instructional design also affects the motivation of students [
51] and the cultural competence of mentors. Previous research [
52] has emphasised a need for improving mentoring programmes related to facilitating learning in a culturally diverse workplace. Moreover, in their recent study, Oikarainen et al. [
53] found that by including cultural competence in developing mentoring competence, RN mentors felt more supportive and competent in supervising culturally and linguistically diverse nursing students. Finally, the digital literacy of RN mentors has been identified as a necessary factor in ensuring successful implementation of a digital pedagogical resource [
8]. In this study, some RN mentors reported difficulties in accessing the DER and in downloading and saving documents. Although earlier research has identified a link between older technology users and lower digital literacy [
19], this finding was not noted in our study. Based on our findings, it is of utmost importance to develop a DER in compliance to the needs of RN mentors and the nursing home context, allocate time for supervision, and incorporate all stakeholders into the implementation of a DER to ensure transparency, engagement, and common grounds and facilitate efficiency in use. The study findings also indicate that despite a thorough co-creative developmental process involving key stakeholders [
1,
31], DERs still have the potential for further development. Moreover, testing and re-testing in a real-life context are recommended to support the implementation of DERs, followed by evaluations among end-users [
22].